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Flexible nanohybrid substrates utilizing gold nanocubes/nano mica platelets with 3D lightning-rod effect for highly efficient bacterial biosensors based on surface-enhanced Raman scattering

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Journal of materials Chemistry B 2024年第13期12卷 3226-3239页

作者： Chen, Yan-Feng Lu, Ming-Chang Lee, Chia-Jung Chiu, Chih-Wei Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Ph.D. Program in Clinical Drug Development of Herbal Medicine College of Pharmacy Taipei Medical University Taipei11031 Taiwan

In this study, gold nanocubes (AuNCs) were quickly synthesized using the seed-mediated growth method and reduced onto the surface of two-dimensional (2D) delaminated nano mica platelets (NMPs), enabling the development of AuNCs/NMPs nanohybrids with a 3D lightning-rod effect. First, the growth-solution amount can be changed to easily adjust the AuNCs average-particle size within a range of 30-70 nm. The use of the cationic surfactant cetyltrimethylammonium chloride as a protective agent allowed the surface of AuNCs and nanohybrids to be positively charged. Positively charged nanohybrid surfaces presented a good adsorption effect for detecting molecules with negative charges on the surface. Additionally, the NMP surfaces were rich in ionic charges and provided a large specific surface area for stabilizing the growth of AuNCs. Delaminated AuNCs/NMPs nanohybrids can generate a 3D hotspot effect through self-assembly to enhance the Raman signal. Surface-enhanced Raman scattering (SERS) is highly sensitive in detecting adenine biomolecules. Its limit of detection (LOD) and Raman enhancement factor reached 10−9 M and 3.6 × 108, respectively. Excellent reproducibility was obtained owing to the relatively regular arrangement of AuNC particles, and the relative standard deviation (RSD) was 10.7%. Finally, the surface of NMPs was modified by adding the hydrophilic poly(oxyethylene)-diamine (POE2000) and amphiphilic PIB-POE-PIB copolymer at different weight ratios. The adjustment of the surface hydrophilicity and hydrophobicity of AuNCs/NMPs nanohybrids led to better adsorption and selectivity for bacteria. AuNCs/POE/NMPs and AuNCs/PIB-POE-PIB/NMPs were further applied to the SERS detection of hydrophilic Staphylococcus aureus and hydrophobic Escherichia coli, respectively. The SERS-detection results suggest that the LOD of hydrophilic Staphylococcus aureus and hydrophobic Escherichia coli reached 92 CFU mL−1 and 1.6 × 102 CFU mL−1, respectively. The AuNCs/POE/NMPs and AuNCs/P

关键词： Substrates

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Magneto-optical conductivity of a band-inverted charge transfer insulator

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Physical Review B 2024年第4期110卷 045445-045445页

作者： Chang Liu Sha-Sha Ke Yong Guo Xiao-Tao Zu Sean Li Hai-Feng Lü School of Physics Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics School of Materials Science and Engineering

Recently, quantum anomalous Hall state has been observed in moiré transition metal dichalcogenide bilayers. Its topological physics can be explained by a band-inverted charge transfer insulator model, in which the topological phase transition occurs in the presence of the band inversion. Starting from an effective three-band low-energy model, we investigate the Landau levels and the magneto-optical conductivity of a band-inverted charge transfer insulator on the honeycomb lattice. We derive the real and imaginary parts of the longitudinal conductivity and Hall conductivity using Kubo formalism. We find that the magneto-optical conductivity indicates a discontinuity at the point of band inversion in the low-frequency regime, which can serve as a probe for band topology. It is shown that the charge transfer gap, chemical potential, and magnetic field have a sensitive effect on the magneto-optical conductivity. The unique band structure also changes the peaks in the imaginary part of the Hall conductivity into two distinct contributions of opposite signs. We also study the relationship of the band-inversion signature and transport properties and highlight its distinct features that can be probed experimentally.

关键词： Electrical conductivity Landau levels Magneto-optics Magnetotransport Quantum transport

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Phase separation and domain crystallinity control enable open-air-printable highly efficient and sustainable organic photovoltaics

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InfoMat 2024年第3期6卷 131-143页

作者： Jie Lv Xiaokang Sun Hua Tang Fei Wang Guangye Zhang Liangxiang Zhu Jiaming Huang Qianguang Yang Shirong Lu Gang Li Frédéric Laquai Hanlin Hu Hoffmann Institute of Advanced Materials Shenzhen Polytechnic UniversityShenzhenthe People's Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhenthe People's Republic of China School of Materials Science and Engineering Xiangtan UniversityXiangtanthe People's Republic of China KAUST Solar Center Physical Sciences and Engineering Division(PSE)Materials Science and Engineering Program(MSE)King Abdullah University of Science and Technology(KAUST)ThuwalKingdom of Saudi Arabia College of New Materials and New Energies Shenzhen Technology UniversityShenzhenthe People's Republic of China Department of Electronic and Information Engineering The Hong Kong Polytechnic UniversityHong Kong SARthe People's Republic of China Department of Material Science and Technology Taizhou UniversityTaizhouthe People's Republic of China

Organic solar cells(OSCs)have emerged as a promising solution for sustainable energy production,offering advantages such as a low carbon footprint,short energy payback period,and compatibility with ***,the use of hazardous solvents continues to dominate the best-performing OSCs,mainly because of the challenges of controlling phase separation and domain crystallinity in *** this study,we combined the solvent vapor treatment of CS2 and thermal annealing to precisely control the phase separation and domain crystallinity in PM6:M-Cl and PM6:O-Cl systems processed with the eco-solvent *** method resulted in a maximum power conversion efficiency(PCE)of 18.4%,which is among the highest values reported for sustainable binary ***,the fabrication techniques were transferred from spin coating in a nitrogen environment to blade printing in ambient air,retaining a PCE of 16.0%,showing its potential for high-throughput and scalable *** addition,a comparative analysis of OSCs processed with hazardous and green solvents was conducted to reveal the differences in phase *** work not only underscores the significance of sustainability in OSCs but also lays the groundwork for unlocking the full potential of open-air-printable sustainable OSCs for commercialization.

关键词： open-air printable organic solar cells sustainability

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Pressure-induced bimetallic carbon nanotubes from metalorganic frameworks as optimized bifunctional electrocatalysts for water splitting

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Rare Metals 2023年第1期42卷 155-164页

作者： Hong-Xu Chen Hui Xu Zhi-Rong Song Yi Liu Hui Cui Jun-Kuo Gao Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province Institute of Optoelectronic Materials and DevicesCollage of Optical and Electronic TechnologyChina Jiliang UniversityHangzhou310018China Institute of Functional Porous Materials School of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou310018China Institute for Composites Science Innovation School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Argonne National Laboratory Physics DivisionLemontIL60439USA Department of Chemistry and International Institute for Nanotechnology(IIN) Northwestern UniversityEvanstonIL60208USA

Carbon nanotubes(CNTs)have attracted great interest in numerous applications due to their excellent electronic and structural ***,harsh synthesis conditions and high energy consumption limit the further application of ***,we developed a facile and innovative strategy to generate CNTs by physically pressurizing metal-organic frameworks(MOFs)and then *** synthesized bimetallic nitrogen/sulfur double-doped carbon nanotubes are denoted as Fe_(x)Co_(1-x)P(x=0.5,0.6,0.7,0.8,0.9).The introduction of pressure not only revolutionized the morphology of the electrocatalysts,but also enhanced the activity of oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)in alkaline ***_(0.6)Co_(0.4)-P exhibits superior OER and HER performances in 1.0 mol·L^(-1)KOH solution with overpotentials of 364 and 346 mV at 10 mA·cm^(-2),which are 28 and 5 mV lower than unpressurized Fe0.6Co0.4.

关键词： Metal-organic frameworks(MOFs) Carbon nanotubes(CNTs) Bifunctional Pressurizing Oxygen evolution reaction(OER) Hydrogen evolution reaction(HER)

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Diffusion effect on the decay of time-resolved photoluminescence under low illumination in lead halide perovskites

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science China(physics,Mechanics & Astronomy) 2023年第8期66卷 115-124页

作者： Huang Li Haipeng Di Xingan Wang Zefeng Ren Ming Lu An-An Liu Xueming Yang Nanlin Wang Yiying Zhao Bohan Li Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Institute of Materials China Academy of Engineering PhysicsJiangyou 621908China Beijing Academy of Quantum Information Sciences Bejing 100193China International Center for Quantum Materials School of PhysicsPeking UniversityBejing 100871China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China

Time-resolved photoluminescence(TRPL)has been extensively used to measure the carrier lifetime in lead halide *** TRPL curves of perovskite materials are usually fitted with a multi-exponential function,instead of a single exponential *** was considered to be a result of the surface and the bulk recombination or the additional radiative recombination caused by the high excited carrier ***,a new model considering the diffusion and the trap-assisted recombination of carriers is proposed to explain the TRPL *** expressions of the TRPL curves and the transient absorption(TA)dynamic curves are theoretically derived,demonstrating that the TRPL curve is an infinite exponential series,regardless of the presence of surface recombination or *** newly developed highly sensitive nanosecond TA and TRPL were employed to measure the carrier dynamics of the same sample under low illumination in the linear response region of TA,thereby experimentally verifying our *** results suggest that the decay of the TRPL is not only a consequence of the carrier recombination but also the carrier *** cannot provide a direct measurement of the carrier lifetime,whereas TA spectroscopy ***,the surface and the bulk recombination can be resolved and the average diffusion coefficient(D)can also be correctly obtained by combining TRPL and TA *** also propose an approximate method for calculating the carrier lifetime and diffusion coefficient of high-quality perovskite *** model provides not only a new interpretation of the dynamics of the PL decay but also a deep insight into the carrier dynamics in the nanosecond time scale under working condition of perovskites solar cells.

关键词： time-resolved photoluminescence(TRPL) lead halide perovskite carrier diffusion ultrafast carrier dynamics

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Understanding the role of four-phonon scattering in the lattice thermal transport of monolayer MoS2

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Physical Review B 2024年第23期109卷 235424-235424页

作者： Saumen Chaudhuri Amrita Bhattacharya A. K. Das G. P. Das B. N. Dev Department of Physics Department of Metallurgical Engineering and Materials Science Research Institute for Sustainable Energy Department of Physics and School of Nano Science and Technology Centre for Quantum Engineering Research and Education

In the calculations of lattice thermal conductivity (κL), vital contributions stemming from four-phonon scattering is often neglected. The significance of four-phonon scattering in the thermal transport properties of monolayer (ML) MoS2 has been unraveled using first-principles calculations combined with the Boltzmann transport equation. If only three-phonon scattering processes are considered then the κL is found to be significantly overestimated (∼115.8Wm−1K−1 at 300 K). With the incorporation of the four-phonon scattering processes, the κL reduces to 24.6 Wm−1K−1, which is found to be closer to the experimentally measured κL of 34.5 Wm−1K−1. Four-phonon scattering significantly impacts the carrier lifetime (τ) of the low-energy out-of-plane acoustic mode (ZA) phonons and thereby, suppresses its contribution in κL from 64% (for three-phonon scattering) to 16% (for both three- and four-phonon scatterings). The unusually high four-phonon scattering rate (τ4−1) of the ZA phonons is attributed to the distinctive quadratic dispersion, along with the combined effects of the acoustic-optical frequency gap, strong anharmonicity, and the selection rule imposed by reflection symmetry. The strong coupling between the dispersion characteristics of the ZA mode and the τ4−1 is discovered through the application of mechanical strain. The strain induced increase in the linearity of the ZA mode dispersion dramatically reduces the significance of the four-phonon scattering in ML-MoS2, both qualitatively and quantitatively. These findings offer valuable insights into the thermal transport phenomena of ML-MoS2, as well as other 2D materials.

关键词： Anharmonic lattice dynamics First-principles calculations Lattice thermal conductivity Phonons 2-dimensional systems Semiconductors Transition metal dichalcogenides Boltzmann theory Density functional theory

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Insight into the structural and optical properties of novel Eu activated NaCl ceramic prepared by cold sintering method

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Ceramics International 2025年第16期51卷 22040-22049页

作者： Li, Yongtao Wang, Xiankuo Li, Weina Xia, Han Li, Jiao Qi, Haina Zhang, Xuejian Huang, Dexin Liu, Huisheng Mahadevan, C.K. School of Materials Science and Engineering Jilin Jianzhu University Changchun130018 China China North Standardization Center Beijing100089 China CSIR Emeritus Scientist Department of Physics Bharathidasan University Tamil Nadu Tiruchirappalli620024 India

The NaCl:xEu3+ (x = 0.002, 0.004, 0.006, 0.008, 0.01, 0.02) ceramics were synthesized using a cold sintering method under varying temperature and pressure conditions. The impact of Eu3+ ions on the structural and optical properties of NaCl ceramics was examined by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), analytical scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), UV–visible spectroscopy, reflectance spectroscopy, photoluminescence (PL) spectroscopy, and fluorescence lifetime measurements. XRD analyses confirmed the incorporation of Eu ions into the matrix lattice. SEM results indicated that the ceramics achieved high density when the uniaxial pressure exceeded 300 MPa. EDS analysis demonstrated a well-distributed presence of rare earth ions, devoid of impurities. PL spectroscopy revealed that the intensity of the emission spectra increased the increase of Eu3+ concentration and observed the optimal luminescence performance at x = 0.01 mol% and a sintering temperature of 125 °C. XPS results indicated that the Eu ions were predominantly in a trivalent state within the NaCl ceramics. Collectively, the above results provide valuable insights for the preparation of rare-earth doped alkali halide ceramics using cold sintering technology. © 2025

关键词： X ray photoelectron spectroscopy

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Voltage-Controlled Synthesis of Higher Harmonics in Hybrid Josephson Junction Circuits

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Physical Review Letters 2024年第18期133卷 186303页

作者： L. Banszerus W. Marshall C. W. Andersson T. Lindemann M. J. Manfra C. M. Marcus S. Vaitiekėnas Center for Quantum Devices Niels Bohr Institute Department of Physics Department of Physics and Astronomy Birck Nanotechnology Center School of Electrical and Computer Engineering School of Materials Engineering Materials Science and Engineering

We report measurements of the current-phase relation of two voltage-controlled semiconductor-superconductor hybrid Josephson junctions (JJs) in series. The two hybrid junctions behave similar to a single-mode JJ with effective transparency determined by the ratio of Josephson coupling strengths of the two junctions. Gate-voltage control of Josephson coupling (measured from switching currents) allows tuning of the harmonic content from sinusoidal, for asymmetric tuning, to highly nonsinusoidal, for symmetric tuning. The experimentally observed tunable harmonic content agrees with a model based on two conventional (sinusoidal) JJs in series.

关键词： Critical current Josephson effect Josephson junctions Semiconductors Superconducting devices Superconductors Resistivity measurements

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The effect of calcium and barium fluoride on CeF3 doped in gadolinium phosphate scintillating glass

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Ceramics International 2025年第16期51卷 22955-22966页

作者： Sarumaha, C.S. Kantuptim, P. Yanagida, T. Intachai, N. Kothan, S. Kim, H.J. Busayaporn, W. Pakawanit, P. Phoovasawat, C. Kaewnuam, E. Kaewkhao, J. Faculty of Science and Technology Muban Chombueng Rajabhat University Ratchaburi 70150 Thailand Nakhon Pathom Rajabhat University Nakhon Pathom73000 Thailand Department of Materials Engineering Faculty of Engineering Kasetsart University Bangkok10900 Thailand Division of Materials Science of Science and Technology Nara Institute of Science and Technology 8916-5 Takayama Ikoma Nara630-0192 Japan Center of Radiation Research and Medical Imaging Department of Radiologic Technology Faculty of Associated Medical Sciences Chiang Mai University Chiang Mai50200 Thailand Department of Physics Kyungpook National University Daegu41566 Korea Republic of Synchrotron Research and Applications Division Synchrotron Light Research Institute 111 University Avenue Muang District Nakhon Ratchasima30000 Thailand Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom73000 Thailand

This study concerns alkaline fluorides such as CaF2 and BaF2 contained in gadolinium phosphate glass doped with CeF3, which were synthesized using a melt-quenching technique. Ce3+ was activated in both glasses and a comparative study of their optical, luminescence and scintillation behaviors was conducted. The results found that the higher atomic weight of BaF2 glass makes higher density compared with CaF2 glass, resulting in more integral scintillation efficiency. The quantum yield of BaF2-glass (PLZGdBafCe0.5) is also higher than that of CaF2-glass (PLZGdCafCe0.5). Energy transfer efficiency from Gd3+ to Ce3+ shows similar values, reflecting that the higher photoluminescence intensity of BaF2-glass comes from the efficiency of the luminescence center (Ce3+ ion). Photoluminescence and scintillation decay times were measured and found to be in the range of nanoseconds. XANES measurement was used to confirm the oxidation state and ratio between Ce3+/Ce4+. Moreover, the practical application of the glass scintillator was succeeded by micro-imaging using synchrotron X-ray. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Photoluminescence

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Unraveling the electrophilic oxygen-mediated mechanism for alcohol electrooxidation on NiO

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National science Review 2023年第5期10卷 251-261页

作者： Wei Chen Jianqiao Shi Chao Xie Wang Zhou Leitao Xu Yingying Li Yandong Wu Binbin Wu Yu-Cheng Huang Bo Zhou Ming Yang Jilei Liu Chung-Li Dong Tehua Wang Yuqin Zou Shuangyin Wang State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringAdvanced Catalytic Engineering Research Center of the Ministry of EducationHunan University College of Chemistry and Chemical Engineering Hunan Normal University College of Materials Science and Engineering Hunan University Research Center for X-ray Science&Department of Physics Tamkang University Shenzhen Institute of Hunan University

Aqueous organic electrosynthesis such as nucleophile oxidation reaction（NOR） is an economical and green ***,its development has been hindered by the inadequate understanding of the synergy between the electrochemical and non-electrochemical *** this study,we unravel the NOR me chanism for the primary alcohol/vicinal diol electro oxidation on ***,the ele ctrochemical step is the generation of Ni3+-（OH）ads,and the spontaneous reaction between Ni3+-（OH）adsand nucle ophiles is an electrocatalyst-induced non-electrochemical *** identify that two electrophilic oxygen-mediated mechanisms（EOMs）,EOM involving hydrogen atom transfer（HAT） and EOM involving C-C bond cleavage,play pivotal roles in the electro oxidation of primary alcohol to carboxylic acid and the electrooxidation of vicinal diol to carboxylic acid and formic acid,*** on these findings,we establish a unified NOR mechanism for alcohol electrooxidation and deepen the understanding of the synergy between the electrochemical and non-electro chemical steps during NOR,which can guide the sustainable electrochemical synthesis of organic chemicals.

关键词： nucleophile oxidation reaction alcohol electrooxidation organic electrosynthesis nickel-based electrocatalysts C-C bond cleavage

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