We investigate the plasmonic responses of gold nanoparticles (AuNP) coated and uncoated on 40nm gold thin film with surrounding medium having different refractive indices using Surface Plasmon Resonance (SPR) ellipsom...
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ISBN:
(纸本)9781439834152
We investigate the plasmonic responses of gold nanoparticles (AuNP) coated and uncoated on 40nm gold thin film with surrounding medium having different refractive indices using Surface Plasmon Resonance (SPR) ellipsometry. The bulk sensitivities obtained from the measurements in both the cases are found to have same order of magnitude. However SPR dip in case of AuNP coated gold thin film has been shifted to longer wavelength (near IR) as compare to the bare gold thin film under the same environment and condition. Hence, it could provide a good platform to study biomolecular interaction where the absorption of light by the biomolucules is minimal. By monitor the induced changes in polarization state or phase of reflected light from the sample surface, which depend on surface properties of the sample, we use these changes as a sensor signal and compare that with theoretical simulation. This kind of characterization technique is non-destructive, label free and it has high sensitivity and sub-nanometer thickness resolution.
The cross plane thermal conductivity of CuFeSe2 thin film was determined by differential 3 omega technique with a deposited Au-Cr narrow strip as the microprobe. The microprobe was driven by an AC current at frequency...
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ISBN:
(纸本)9781605950150
The cross plane thermal conductivity of CuFeSe2 thin film was determined by differential 3 omega technique with a deposited Au-Cr narrow strip as the microprobe. The microprobe was driven by an AC current at frequency ω and result a third-harmonic voltage corresponding to the temperature drop for the calculation of thermal conductivity across the thin film. In order to obtain the accurate data by excluding the influence of thermal resistance of interfaces between film and substrate, a series of thin films with various thickness of 200, 400, 600 and 800 nm were prepared for systematic study. Basically the thermal conductivity is linearly dependent on temperature for T=100-350 K. One interesting finding is that the thinner the film the larger the thermal conductivity. For example, at 300 K the thermal conductivity of the 200 nm thin film is about 8.8 W·m-1·K-1, whereas the thermal conductivity of 600 and 800 nm films are 2.4 and 1.7 W·m-1·K-1 respectively. This consequence is attributed to the better crystallization in thinner films that was confirmed by X-ray diffraction analysis.
The reconstruction and evaporation at graphene nanoribbon (GNR) edges are investigated by tight-binding molecular-dynamics simulations and ab initio calculations. It is observed that reconstruction through the formati...
The reconstruction and evaporation at graphene nanoribbon (GNR) edges are investigated by tight-binding molecular-dynamics simulations and ab initio calculations. It is observed that reconstruction through the formation of pentagon-heptagon pairs can take place quickly along the zigzag edge and it is energetically favorable. At very high temperatures, the armchair edge is found to change into a zigzag edge structure, which further accelerates the evaporation of carbon atoms and leads to the formation of carbon linear chains. The evaporation of carbon atoms from both the zigzag and armchair edges is preceded by the formation of heptagon rings, which serve as a gateway for carbon atoms to escape. In the simulation for a GNR armchair-zigzag-armchair junction, carbon atoms are evaporated row by row from the outermost row of the zigzag edge while the armchair edge remains nearly intact. These results can be applied to nanoelectronic devices fabrication through the temperature-controlled edge structure of GNR.
A new scanning transmission electron microscopy (STEM) imaging technique using high-order Laue zones (named HOLZ-STEM), a diffraction contrast which has been strenuously avoided or minimized in traditional STEM imagin...
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A new scanning transmission electron microscopy (STEM) imaging technique using high-order Laue zones (named HOLZ-STEM), a diffraction contrast which has been strenuously avoided or minimized in traditional STEM imaging, can be used to obtain the additional 1D periodic information along the electron propagation axis without sacrificing atomic resolution in the lateral (2D) dimension. HOLZ-STEM has been demonstrated to resolve the 3D long-range Na ordering of Na0.71CoO2. Direct evidence of spiral-like Na-trimer chains twisting along the c axis is unambiguously established in real space.
We developed an optical tweezers directed approach that allows synthesis of different oligonucleotide on an array of controlled pore glass (CPG) beads in parallel in a two-stream laminar flow microreactor and obtained...
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We developed an optical tweezers directed approach that allows synthesis of different oligonucleotide on an array of controlled pore glass (CPG) beads in parallel in a two-stream laminar flow microreactor and obtained one oligo sequence per bead. This reactor has been shown to effectively facilitate CPG bead loading and confinement, maintain liquid/ liquid (inert liquid/reagent) interface and withstand the reagents and solvents present in the modified phosphoramidite chemistry. The optical tweezers allows us to externally manipulate the CPG beads inside the channel without having to modify the microfluidic device itself. The parallel synthesis of several different oligonucleotides in a single synthetic run was demonstrated.
A T-shaped plasmonic array is proposed for application as an effective thermal emitter or biosensor. The reflection and thermal radiation properties of a T-shaped array are investigated theoretically. The angular depe...
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This paper presents a micro capacitive humidity sensor based on polyimide nano-grass with improved performance such as quick response and high sensitivity. These benefits come from the modification of polyimide surfac...
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