Xuefeng He

ORCID: 0000-0002-7624-2941
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About
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Research Areas
  • Innovative Microfluidic and Catalytic Techniques Innovation
  • Advanced Photocatalysis Techniques
  • Laser-induced spectroscopy and plasma
  • Electrowetting and Microfluidic Technologies
  • Carbon Nanotubes in Composites
  • Microfluidic and Capillary Electrophoresis Applications
  • Analytical chemistry methods development
  • Electrohydrodynamics and Fluid Dynamics
  • Diamond and Carbon-based Materials Research
  • TiO2 Photocatalysis and Solar Cells
  • Heat Transfer and Boiling Studies
  • Microfluidic and Bio-sensing Technologies
  • Mechanical and Optical Resonators
  • Nanowire Synthesis and Applications
  • Innovative Energy Harvesting Technologies
  • Electrocatalysts for Energy Conversion
  • CO2 Reduction Techniques and Catalysts
  • Catalytic Processes in Materials Science
  • Advanced Sensor and Energy Harvesting Materials
  • Microbial Fuel Cells and Bioremediation
  • High-pressure geophysics and materials
  • Spectroscopy Techniques in Biomedical and Chemical Research
  • Fluid Dynamics and Heat Transfer
  • Cultural Heritage Materials Analysis
  • Surface Modification and Superhydrophobicity

South China Normal University
2025

Chongqing University
2009-2024

Chongqing University of Technology
2020-2024

Harbin Institute of Technology
2024

Yunnan Normal University
2024

East China University of Science and Technology
2023

Institute of Engineering Thermophysics
2014-2021

University of Nebraska–Lincoln
2008-2021

Huazhong Agricultural University
2020

Stony Brook University
2003

The synthesis of structurally diverse amines is fundamental significance in the pharmaceutical industry due to ubiquitous presence amine motifs biologically active molecules. Biocatalytic reductive amination for production has attracted great interest owing its synthetic advantages. Herein, we report direct a wide range sterically demanding secondary amines, including several important ingredients and intermediates, via carbonyl substrates bulky nucleophiles employing imine reductases. Key...

10.1021/jacs.2c11354 article EN Journal of the American Chemical Society 2023-01-20

Gold-coated horizontally aligned carbon nanotube (Au-HA-CNT) substrates were fabricated for surface-enhanced Raman spectroscopy (SERS). The Au-HA-CNT substrates, which are granular in nature, easy-to-prepare with large SERS-active area. Enhancement factors (EFs) of ∼107 achieved using the Au-HA-CNTs as rhodamine 6G (R6G) molecules. Maximum enhancement was found when polarization direction (E-field) incident laser beam parallel to HA-CNTs. Simulations finite-difference time-domain (FDTD)...

10.1088/0957-4484/23/20/205702 article EN Nanotechnology 2012-04-30

In laser-induced breakdown spectroscopy (LIBS), a pair of aluminum-plate walls were used to spatially confine the plasmas produced in air by first laser pulse (KrF excimer laser) from chromium (Cr) targets with second (Nd:YAG at 532 nm, 360 mJ/pulse) introduced parallel sample surface re-excite plasmas. Optical emission enhancement was achieved combing spatial confinement and dual-pulse LIBS (DP-LIBS), then optimized adjusting distance between two interpulse delay time both pulses. A...

10.1364/oe.20.001436 article EN cc-by Optics Express 2012-01-09

Microalgae are extensively researched as potential feedstocks for biofuel production. Energy-rich compounds in microalgae, such lipids, require efficient characterization techniques to investigate the metabolic pathways and environmental factors influencing their accumulation. The model green alga Coccomyxa accumulates significant amounts of triacylglycerols (TAGs) under nitrogen depletion (N-depletion). To monitor growth TAGs (lipid) microalgal cells, a study cells (Coccomyxa sp. C169)...

10.1364/boe.3.002896 article EN cc-by Biomedical Optics Express 2012-10-18

A catalyst-free and highly efficient synthetic method for growing carbon nano-onions (CNOs) in open air has been developed through the laser resonant excitation of a precursor molecule, ethylene, combustion process. Highly concentric CNO particles with improved crystallinity were obtained at wavelength 10.532 µm CH(2) wagging mode ethylene molecules. higher growth rate up to 2.1 g h( - 1) was obtained, compared that without (1.3 1)). Formation CNOs ordered graphitic shells is ascribed...

10.1088/0957-4484/22/16/165604 article EN Nanotechnology 2011-03-11

Ultraprecise manipulation of the droplets at microscale is a promising paradigm for broad implications in reagent transport and element analysis, but existing strategies still suffer from cross-contamination or miscellaneous auxiliaries. Inspired by levitation, we develop method excellently manipulating levitated femtoliter/picoliter single focused laser. We show that unique light-induced vapor flow association with interface morphology responsible creation droplets. In particular,...

10.1021/acs.jpclett.8b03699 article EN The Journal of Physical Chemistry Letters 2019-02-13

Conventional photocatalytic ozonation usually suffers from the mass transport issue associated with low specific surface area and gas/liquid interface liquid film. To address this issue, a new membrane microreactor based on optofluidics was developed for wastewater treatment by in work. The key component of prepared coating TiO2 onto carbon paper followed hydrophobic polytetrafluoroethylene. Such design offered several advantages such as large surface-area-to-volume ratio, enhanced...

10.1021/acs.iecr.6b00562 article EN Industrial & Engineering Chemistry Research 2016-07-12

Self-aligned growth of ultra-short single-walled carbon nanotubes (SWNTs) was realized by utilizing optical near-field effects in a laser-assisted chemical vapor deposition (LCVD) process. By introducing the effects, bridge structures containing single suspended SWNT channels were successfully fabricated through LCVD process at relatively low substrate temperature. Raman spectroscopy and I-V analyses have been carried out to characterize SWNT-bridge structures. Numerical simulations using...

10.1088/0957-4484/20/2/025601 article EN Nanotechnology 2008-12-09

Photoabsorption studies of red fluorescent protein chromophore anions have been performed at the ELISA electrostatic heavy-ion storage ring. The broad absorption band due to electronic excitation chromophores is tuned a longer wavelength (redshifted) by extending conjugation molecule. A clear vibrational progression resolved with E(vib) approximately 380 and 520 cm(-1) for two different forms chromophore. modes correspond collective motions entire molecular structure. It argued that excited...

10.1103/physrevlett.90.118103 article EN Physical Review Letters 2003-03-21

Nitrogen-doped diamond was synthesized in open air using laser-assisted combustion flame method. A wavelength-tunable CO2 laser used to resonantly excite the vibration modes of ammonia molecules, which were added into forming flame. The wavelength tuned match frequencies NH wagging mode molecules. High efficiency energy coupling achieved at wavelengths 9.219, 10.35, and 10.719 μm, are related a rotational–vibrational transition (1084.63 cm−1), splitting (υ2+, 932.51 cm−1 υ2−, 968.32 cm−1)....

10.2351/1.3685299 article EN Journal of Laser Applications 2012-02-28

The novelty of the work: a 3D oriented CuS/Cu<sub>2</sub>O/Cu nanowire photocathode on copper foam toward oxygen reduction reaction for photocatalytic fuel cell.

10.1039/d0ta11020e article EN Journal of Materials Chemistry A 2021-01-01
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