The Experts below are selected from a list of 12936 Experts worldwide ranked by ideXlab platform

Baoping Zhang - One of the best experts on this subject based on the ideXlab platform.

  • cmos compatible fabrication of micro nano convex silicon lens arrays by conformal chemical vapor deposition
    Optics Express, 2017
    Co-Authors: Haijie Zuo, Dukyong Choi, Xin Gai, Barry Lutherdavies, Baoping Zhang
    Abstract:

    We present a novel CMOS-compatible fabrication technique for convex micro-nano lens arrays (MNLAs) with High Packing Density on the wafer scale. By means of conformal chemical vapor deposition (CVD) of hydrogenated amorphous silicon (a-Si:H) following patterning of silicon pillars via electron beam lithography (EBL) and plasma etching, large areas of a close packed silicon lens array with the diameter from a few micrometers down to a few hundred nanometers was fabricated. The resulting structure shows excellent surface roughness and High uniformity. The optical focusing properties of the lenses at infrared wavelengths were verified by experimental measurements and numerical simulation. This approach provides a feasible solution for fabricating silicon MNLAs compatible for next generation large scale, miniaturized optical imaging detectors and related optical devices.

Haijie Zuo - One of the best experts on this subject based on the ideXlab platform.

  • cmos compatible fabrication of micro nano convex silicon lens arrays by conformal chemical vapor deposition
    Optics Express, 2017
    Co-Authors: Haijie Zuo, Dukyong Choi, Xin Gai, Barry Lutherdavies, Baoping Zhang
    Abstract:

    We present a novel CMOS-compatible fabrication technique for convex micro-nano lens arrays (MNLAs) with High Packing Density on the wafer scale. By means of conformal chemical vapor deposition (CVD) of hydrogenated amorphous silicon (a-Si:H) following patterning of silicon pillars via electron beam lithography (EBL) and plasma etching, large areas of a close packed silicon lens array with the diameter from a few micrometers down to a few hundred nanometers was fabricated. The resulting structure shows excellent surface roughness and High uniformity. The optical focusing properties of the lenses at infrared wavelengths were verified by experimental measurements and numerical simulation. This approach provides a feasible solution for fabricating silicon MNLAs compatible for next generation large scale, miniaturized optical imaging detectors and related optical devices.

Wen Yang - One of the best experts on this subject based on the ideXlab platform.

  • synthesis of biomass derived carbon induced by cellular respiration in yeast for supercapacitor applications
    Chemistry: A European Journal, 2018
    Co-Authors: Yimeng Lian, Lei Zhou, Renjie Chen, Wen Yang
    Abstract:

    Because activated carbon is extensively used in supercapacitors, optimization of its precursors and synthetic strategies are crucial. Inspired by the rich sugar content of banana peel waste, which can be transformed through the respiration of yeast into alcohol with the release of CO2 , we developed an environmentally benign and Highly efficient process for the production of renewable heteroatom-doped hierarchical porous carbon materials (yeast-treated banana-peel-based carbon, denoted as YBP) without any additional templates or activation agents. The resulting biologically activated carbon was characterized by near-edge X-ray absorption fine-structure spectroscopy, X-ray photoelectron spectroscopy, and other physical methods. The biologically activated carbon achieved a maximum gravimetric specific capacitance of 476 F g-1 in 1 m H2 SO4 electrolyte. Remarkably, with a moderate specific surface area of 1084 m2  g-1 , the as-obtained activated carbon was found to have a High Packing Density. With enriched pseudocapacitance sites, the YBP symmetric supercapacitor has a High volumetric specific capacitance and energy Density (maximum values of 264 F cm-3 and 23.5 Wh L-1 , respectively). The supercapacitor showed superior cyclic stability, with 94 % capacitance retention for voltage values up to 1.6 V after 10 000 cycles, which confirmed the promising application of this supercapacitor in miniature electronic devices.

Seok Ju Kang - One of the best experts on this subject based on the ideXlab platform.

  • electrochemical scissoring of disordered silicon carbon composites for High performance lithium storage
    Energy Storage Materials, 2021
    Co-Authors: Jaegeon Ryu, Taesoo Bok, Se Hun Joo, Seokkeun Yoo, Gyujin Song, Su Hwan Kim, Sungho Choi, Hu Young Jeong, Min Gyu Kim, Seok Ju Kang
    Abstract:

    Abstract Practically adapted physical integration of silicon and carbon predominates as a viable solution to realize High energy Density batteries, however, the composite structure is vulnerable to fracture. Here we report a molecular-level mixed silicon-carbon composite anode through thermal pyrolysis of silane and subsequent mechanical mill, entailed by electrochemical dissociation and reclustering of such disordered silicon-carbon bonds during the cycles. Lithium insertion induces heterolytic fission of the bonds into sub-nanometre silicon particles segregated by redox-active carbon framework validated by microscopy analysis and reactive molecular dynamics simulation. The embedded structure with a High Packing Density of silicon prevents detrimental electrochemical coalescence and direct contact to a liquid electrolyte to stabilize the interfaces, while three-dimensional (3D) carbon framework buffers large volume expansion of silicon to enable an extended full battery cycling.

Xin Gai - One of the best experts on this subject based on the ideXlab platform.

  • cmos compatible fabrication of micro nano convex silicon lens arrays by conformal chemical vapor deposition
    Optics Express, 2017
    Co-Authors: Haijie Zuo, Dukyong Choi, Xin Gai, Barry Lutherdavies, Baoping Zhang
    Abstract:

    We present a novel CMOS-compatible fabrication technique for convex micro-nano lens arrays (MNLAs) with High Packing Density on the wafer scale. By means of conformal chemical vapor deposition (CVD) of hydrogenated amorphous silicon (a-Si:H) following patterning of silicon pillars via electron beam lithography (EBL) and plasma etching, large areas of a close packed silicon lens array with the diameter from a few micrometers down to a few hundred nanometers was fabricated. The resulting structure shows excellent surface roughness and High uniformity. The optical focusing properties of the lenses at infrared wavelengths were verified by experimental measurements and numerical simulation. This approach provides a feasible solution for fabricating silicon MNLAs compatible for next generation large scale, miniaturized optical imaging detectors and related optical devices.