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Optimizing Optical Dielectrophoretic (ODEP) Performance: Position- and Size-Dependent Droplet Manipulation in an Open-Chamber Oil Medium.
Micromachines (Basel)
January 2024
Department of Mechanical Engineering, San Diego State University, San Diego, CA 92182-1323, USA.
An optimization study is presented to enhance optical dielectrophoretic (ODEP) performance for effective manipulation of an oil-immersed droplet in the floating electrode optoelectronic tweezers (FEOET) device. This study focuses on understanding how the droplet's position and size, relative to light illumination, affect the maximum ODEP force. Numerical simulations identified the characteristic length () of the electric field as a pivotal factor, representing the location of peak field strength.
View Article and Find Full Text PDFTwo dimensional NbSe/NbO metal-semiconductor heterostructure-based photoelectrochemical photodetector with fast response and high flexibility.
Nanoscale Horiz
July 2023
School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China.
Two dimensional (2D) metal-semiconductor heterostructures are promising for high-performance optoelectronic devices due to fast carrier separation and transportation. Considering the superior metallic characteristics accompanied by high electrical conductivity in NbSe, surface oxidation provides a facile way to form NbSe/NbO metal-semiconductor heterostructures. Herein, size-dependent NbSe/NbO nanosheets were achieved by a liquid phase exfoliation method and a gradient centrifugation strategy.
View Article and Find Full Text PDFPhotoelectrical Properties Investigated on Individual Si Nanowires and Their Size Dependence.
Nanoscale Res Lett
January 2021
State Key Laboratory of Surface Physics, Fudan University, Shanghai, 200433, China.
Periodically ordered arrays of vertically aligned Si nanowires (Si NWs) are successfully fabricated with controllable diameters and lengths. Their photoconductive properties are investigated by photoconductive atomic force microscopy (PCAFM) on individual nanowires. The results show that the photocurrent of Si NWs increases significantly with the laser intensity, indicating that Si NWs have good photoconductance and photoresponse capability.
View Article and Find Full Text PDFSurface-Guided CsPbBr Perovskite Nanowires on Flat and Faceted Sapphire with Size-Dependent Photoluminescence and Fast Photoconductive Response.
Nano Lett
January 2018
Department of Materials and Interfaces and ‡Chemical Research Support, Weizmann Institute of Science, Rehovot, 76100, Israel.
All-inorganic lead halide perovskite nanowires have been the focus of increasing interest since they exhibit improved stability compared to their hybrid organic-inorganic counterparts, while retaining their interesting optical and optoelectronic properties. Arrays of surface-guided nanowires with controlled orientations and morphology are promising as building blocks for various applications and for systematic research. We report the horizontal and aligned growth of CsPbBr nanowires with a uniform crystallographic orientation on flat and faceted sapphire surfaces to form arrays with 6-fold and 2-fold symmetries, respectively, along specific directions of the sapphire substrate.
View Article and Find Full Text PDFMultiple exciton generation induced enhancement of the photoresponse of pulsed-laser-ablation synthesized single-wall-carbon-nanotube/PbS-quantum-dots nanohybrids.
Sci Rep
February 2016
Institut National de la Recherche Scientifique, Centre-Énergie, Matériaux et Télécommunications, 1650, Blvd. Lionel-Boulet, Varennes, Qc, J3X-1S2, Canada.
The pulsed laser deposition method was used to decorate appropriately single wall carbon nanotubes (SWCNTs) with PbS quantum dots (QDs), leading to the formation of a novel class of SWCNTs/PbS-QDs nanohybrids (NHs), without resorting to any ligand engineering and/or surface functionalization. The number of laser ablation pulses (NLp) was used to control the average size of the PbS-QDs and their coverage on the SWCNTs' surface. Photoconductive (PC) devices fabricated from these SWCNTs/PbS-QDs NHs have shown a significantly enhanced photoresponse, which is found to be PbS-QD size dependent.
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