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Low pump threshold cVD graphene based passively harmonic mode-locked fibre laser

ELEcTRONIcS LETTERS 2017年第5期53卷 330-+页

作者： chow, Kin Kee Manchester Metropolitan Univ Sch Engn John Dalton BldgChester St Manchester M1 5GD Lancs England

A low pump threshold passively harmonic mode-locked fibre laser is demonstrated. The key component is a chemical vapour deposition grown graphene saturable absorber to enable higher order harmonic mode-locking (HML) of the fibre laser with good output noise characteristics. With a relatively low pump power of 100 mW, the fibre laser generates approximate to 1 ps soliton pulses at the 21st order of HML with 40 dB of super-mode noise suppression.

关键词： fibre lasers laser mode locking laser noise optical pumping optical saturable absorption optical solitons optical harmonic generation optical pulse generation graphene c power 100 mW super-mode noise suppression soliton pulses output noise characteristics higher order HML higher order harmonic mode-locking graphene saturable absorber chemical vapour deposition passively harmonic mode-locked fibre laser low pump threshold cVD graphene

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Elastic and conductive MWcNT/SBS nanocomposites as superior piezoresistive sensors

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MIcRO & NANO LETTERS 2017年第1期12卷 17-19页

作者： Duan, Zhi-Qiang Li, Tian-Peng Yao, Kai Xuan, Zhao-Long Liu, Yi-Tao Shijiazhuang Mech Engn Coll Shijiazhuang 050003 Peoples R China Equipment Acad Dept Grad Management Beijing 101416 Peoples R China Tsinghua Univ Dept Precis Instrument State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China

Herein conductive elastomers by homogeneous distribution of multi-walled carbon nanotubes (MWcNTs) in a styrene-co-butadiene-co-styrene (SBS) triblock copolymer matrix is reported. The inherent pi-pi stacking ensures nearly single-layer adsorption of the SBS molecules on the surfaces of MWcNTs, translating into reliable interfacial interactions. The resulting MWcNT/SBS nanocomposites are highly elastic and conductive. It is believed that this finding opens up a new way to fabricate conductive elastomers holding great promise as superior piezoresistive sensors that may integrate a 'touch' function in wearable electronics and computers.

关键词： multi-wall carbon nanotubes filled polymers polymer blends nanocomposites nanofabrication piezoresistive devices nanosensors elastomers conducting polymers adsorption elastic nanocomposite conductive MWcNT-SBS nanocomposite piezoresistive sensors conductive elastomers homogeneous multiwalled carbon nanotube distribution styrene-co-butadiene-co-styrene triblock copolymer matrix inherent π-π stacking nearly single-layer adsorption MWcNT surfaces interfacial interactions touch function wearable electronics computers c

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carbon films as perfect electromagnetic wave absorbers and anti-reflectors

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MIcRO & NANO LETTERS 2017年第5期12卷 312-314页

作者： Batrakov, Konstantin Paddubskaya, Alesya Kuzhir, Polina Belarusian State Univ Inst Nucl Problems Minsk 220030 BELARUS Ryazan State Radio Engn Univ Ryazan 390005 Russia

It is shown that thin carbon coating with thicknesses, depending on its structure and porosity, ranging from tens of nanometres to tens of microns can absorb almost all incident microwave radiation without reflection. Special conditions on dielectric properties of substrate and conductivity of carbon material, which are necessary for the realisation of such a perfect absorber, are derived. The conductance of the carbon coating can then be controlled by proper porosity.

关键词： carbon thin films coatings electromagnetic wave absorption porosity electrical conductivity thin carbon coating carbon films electromagnetic wave absorbers electromagnetic wave antireflectors porosity dielectric properties electrical conductivity microwave radiation c

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Immune mechanisms of vaccine induced protection against chronic hepatitis c virus infection in chimpanzees

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World Journal of Hepatology 2015年第1期7卷 53-69页

作者： Babs E Verstrepen André Boonstra Gerrit Koopman Department of Virology Biomedical Primate Research Centre2280GH RijswijkThe Netherlands Department of Gastroenterology and Hepatology Erasmus University Medical Center Rotterdam3015 CE RotterdamThe Netherlands

Hepatitis c virus(HcV) infection is characterized by a high propensity for development of life-long viral persistence. An estimated 170 million people suffer from chronic hepatitis caused by HcV. currently,there is no approved prophylactic HcV vaccine *** the near disappearance of the most relevant animal model for HcV,the chimpanzee,we review the progression that has been made regarding prophylactic vaccine development against HcV. We describe the results of the individual vaccine evaluation experiments in chimpanzees,in relation to what has been observed in humans. The results of the different studies indicate that partial protection against infection can be achieved,but a clear correlate of protection has thus far not yet been defined.

关键词： Hepatitis c virus Vaccines chimpanzees Review Prophylactic Antibodies T-cells

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Mi R-122 in hepatitis B virus and hepatitis c virus dual infection

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World Journal of Hepatology 2015年第3期7卷 498-506页

作者： Kyoungsub Song chang Han Srikanta Dash Luis A Balart Tong Wu Department of Pathology and Laboratory Medicine Tulane University School of Medicine Department of Medicine Tulane University School of Medicine

Hepatitis B virus(HBV) and hepatitis c virus(HcV) infections are the most common causes of chronic liver diseases and hepatocelluar carcinomas. Over the past few years, the liver-enriched micro RNA-122(mi R-122) has been shown to differentially regulate viral replication of HBV and HcV. It is notable that thelevel of mi R-122 is positively and negatively regulated by HcV and HBV, respectively. consistent with the welldocumented phenomenon that mi R-122 promotes HcV accumulation, inhibition of mi R-122 has been shown as an effective therapy for the treatment of HcV infection in both chimpanzees and humans. On the other hand, mi R-122 is also known to block HBV replication, and HBV has recently been shown to inhibit mi R-122 expression; such a reciprocal inhibition between mi R-122 and HBV suggests an intriguing possibility that mi R-122 replacement may represent a potential therapy for treatment of HBV infection. As HBV and HcV have shared transmission routes, dual infection is not an uncommon scenario, which is associated with more advanced liver disease than either HBV or HcV mono-infection. Thus, there is a clear need to further understand the interaction between HBV and HcV and to delineate the role of mi R-122 in HBV/HcV dual infection in order to devise effective therapy. This review summarizes the current understanding of HBV/HcV dual infection, focusing on the pathobiological role and therapeutic potential of mi R-122.

关键词： MiR-122 Hepatitis B virus Hepatitis c virus Hepatitis B virus/hepatitis c virus dual infection

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P-doping decrease and mobility increase of graphene in atmosphere

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MIcRO & NANO LETTERS 2017年第1期12卷 20-22页

作者： Zhang, Qingwei Li, Ping Wang, Gang Univ Elect Sci & Technol China State Key Lab Elect Thin Films & Integrated Devic Chengdu 610054 Peoples R China

An approach to decrease the P-doping density of graphene and increase the mobility of graphene field-effect transistors (GFETs) is reported. With a layer of natural aluminium oxide (natural-AlOx) thin film covered on the surface of graphene, the Dirac point voltage of the GFETs decreases 25 V while it experiences the mobility increase of 42 cm(2)/(V s) after exposure in the atmosphere for 1 month. To understand this phenomenon, other two situations are researched, the Dirac point voltage of the identical GFETs with no thin film on graphene increases more than 15 V and its mobility decreases 90 cm(2)/(V s) after 1 month. The last situation is that the Dirac point voltage and the mobility have no significant changes with an AlOx deposited by electron beam evaporation (Al2O3-EBE) on graphene. These phenomena indicate that the natural-AlOx thin film is capable of reducing p-type impurities on the graphene and bringing the better reliability to the GFETs.

关键词： carrier mobility graphene doping profiles field effect transistors aluminium compounds electron beam deposition vacuum deposition mobility increase graphene surface P-doping density field effect transistors natural aluminium oxide thin film Dirac point voltage electron beam evaporation reliability c AlOx

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Liver steatosis in hepatitis c patients

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World Journal of Hepatology 2015年第10期7卷 1337-1346页

作者： Emilio González-Reimers Geraldine Quintero-Platt Melchor Rodríguez-Gaspar Remedios Alemán-Valls Onán Pérez-Hernández Francisco Santolaria-Fernández Servicio de Medicina Interna Hospital Universitario de CanariasUniversidad de La LagunaTenerife

There is controversy regarding some aspects of hepatitis c virus(HcV) infection-associated liver steatosis,and their relationship with body fat stores. It has classically been found that HcV,especially genotype 3,exerts direct metabolic effects which lead to liver steatosis. This supports the existence of a so called viral steatosis and a metabolic steatosis,whichwould affect HcV patients who are also obese or diabetics. In fact,several genotypes exert metabolic effects which overlap with some of those observed in the metabolic syndrome. In this review we will analyse the pathogenic pathways involved in the development of steatosis in HcV patients. Several cytokines and adipokines also become activated and are involved in "pure" steatosic effects,in addition to inflammation. They are probably responsible for the evolution of simple steatosis to steatohepatitis,making it difficult to explain why such alterations only affect a proportion of steatosic patients.

关键词： Hepatitis c virus steatosis adiponectin Leptin Insulin resistance Proinflammatory cytokines Triglyceride synthesis Fatty acid oxidation

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Synthesis of carbon nanoparticles from mustard oil and evaluation of their antibacterial activity against dental caries

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MIcRO & NANO LETTERS 2017年第10期12卷 799-802页

作者： Gautam, Gorika Jha, Diksha Gaurav, Shailendra S. Sharma, Ashwani K. Kumar, Pradeep Gautam, Hemant K. CSIR Inst Genom & Integrat Biol Mathura Rd New Delhi India CSIR Inst Genom & Integrat Biol Mall Rd Delhi India Univ Meerut CCS Dept Biotechnol Meerut Uttar Pradesh India

Dental infections are thorny since time immemorial mainly due to the accumulation of plaque on the teeth surface. Antibiotics are slowly losing their capability to degrade bacteria due to development of resistance in them which necessitates the need of new drug formulations. The role of carbon for tartar and plaque removal in the form of charcoal powder is seen for ages. Hence, in this study, nanotised form of carbon has been exploited for their role against resistant bacteria. Green synthesis of carbon nanoparticles (cNPs) was accomplished from the soot of the burning mustard oil which was collected on clay pots. The synthesised particles were characterised by UV spectroscopy, dynamic light scattering and transmission electron microscopy. Antibiotic sensitivity test of the isolated oral bacteria from dental cavity, post cavity and cavity-free patients was done in order to find out the antibiotic resistant bacteria. Antimicrobial efficiency (minimum inhibitory concentration) of cNPs was carried out on these antibiotic resistant bacteria and observed their microbial killing potential. Hemolysis assay was conducted to comprehend the toxicity of these nanoparticles on human cells. cell viability study on MRc-5 cell line showed that nanoparticles are safe to use.

关键词： nanoparticles carbon nanofabrication nanomedicine antibacterial activity biomedical materials microorganisms dentistry drugs ultraviolet spectra light scattering transmission electron microscopy blood toxicology cellular biophysics antimicrobial efficiency minimum inhibitory concentration microbial killing potential hemolysis assay toxicity human cells cell viability MRc-5 cell line c antibiotic resistant bacteria cavity-free patients post cavity dental cavity isolated oral bacteria antibiotic sensitivity test transmission electron microscopy dynamic light scattering UV spectroscopy clay pots burning mustard oil green synthesis nanotised form charcoal powder plaque removal tartar drug formulations bacteria degradation teeth surface plaque accumulation dental infections dental caries antibacterial activity carbon nanoparticles

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Structure of nanographite synthesised by electrochemical oxidation and exfoliation of polycrystalline graphite

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MIcRO & NANO LETTERS 2017年第12期12卷 955-959页

作者： Radon, Adrian Lukowiec, Dariusz Silesian Tech Univ Fac Mech Engn Konarskiego 18 A St PL-44100 Gliwice Poland

The Letter presents the results of characterisation of intercalated and exfoliated graphite. The electrochemically exfoliated graphite (EEG) was synthesised in solution containing sulphuric acid and potassium chlorate(V). The number of graphene layers, degree of disordering and the presence of functional groups were determined using X-ray diffraction method, Raman spectroscopy, Fourier transform infrared spectroscopy and UV-visible spectroscopy. High-resolution transmission electron microscopy and scanning electron microscopy were used to imaging morphology and structure of the synthesised material. The obtained micrographs indicate the presence of highly disordered areas near the edge of flakes and in-plane ordered lattice structure in the flat zone between disordered areas. X-ray diffraction patterns clearly indicate the presence of both nanographite and graphene oxide. The EEG was also characterised by relatively high thermal stability, which was confirmed using thermogravimetric analysis.

关键词： graphite nanostructured materials oxidation electrochemistry X-ray diffraction Raman spectra Fourier transform infrared spectra ultraviolet spectra visible spectra transmission electron microscopy scanning electron microscopy thermal stability thermal analysis nanographite electrochemical oxidation exfoliation polycrystalline graphite intercalated graphite electrochemically exfoliated graphite EEG sulfuric acid potassium chlorate X-ray diffraction method Raman spectroscopy Fourier transform infrared spectroscopy UV-visible spectroscopy high-resolution transmission electron microscopy scanning electron microscopy in-plane ordered lattice structure graphene oxide thermal stability thermogravimetric analysis c

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Growth of nanocarbons by catalysis and their applications

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MRS BULLETIN 2017年第11期42卷 790-793页

作者： Thrower, Peter A. cheng, Hui-Ming Penn State Univ Dept Mat Sci & Engn University Pk PA 16802 USA Chinese Acad Sci Inst Met Res Shenyang Natl Lab Mat Sci Beijing Peoples R China Tsinghua Univ Tsinghua Berkeley Shenzhen Inst Beijing Peoples R China

Nanocarbons, such as carbon nanotubes and graphene, have had a remarkable history and impact on current applications. We briefly review the genesis and development of nanocarbons over the last 50 years, referencing key articles, including the role of catalysts in their formation. This issue focuses on the formation mechanisms and controlled growth of carbon nanotubes and graphene on substrates through catalytic processes. The five contributions in this issue review the mechanisms and theory of catalytic growth of nanocarbons (carbon nanotube forests, superaligned arrays, single-wall carbon nanotubes), the growth of large-quantity, high-quality graphene on metal substrates, and the unique and excellent properties for current and potential commercial applications.

关键词： c catalytic nanoscale

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