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High-Voltage Electron Microscope

High-Voltage Electron Microscope Leading-edge Equipment Home

Equipment Introduction

The High Voltage Electron Microscope (HVEM) utilizes a high accelerating voltage for structural analysis at atomic-resolution. The HVEM is employed in basic and applied sciences, such as in structural analysis of new materials and development of infinitesimal materials.

Characteristics of the Equipment

  • Observation of three-dimensional (3-D) atomic structure of materials by concurrently implementing its atomic resolution (0.12 nm) and high tilt specimen angle (±60°)
  • Chemical signal detection with high collection rate using the advanced energy filtering system (HV-GIF) that utilizes the relativity effect
  • In-situ and Cryo-EM analysis with customized specimen holder

Representative Research Case

Direct observation of thermal disorder and decomposition of black phosphorus

The initial thermal disorder and decomposition of black phosphorus were examined using in situ heating experiments. The breaking of crystallographic symmetry can be initiated by the surficial vacancy and proceeds toward both interlayer ([010]) and intralayer ([001]) directions. The results on the thermal behavior of black phosphorus provide useful guidance for thin film deposition and fabrication processes with black phosphorus.

Investigation of the initial thermal disorder and decomposition mechanism of black phosphorus

Application

  • Atomic structure analysis of the nano materials
  • Real-time structure analysis

Representative Research Papers

  • One-Pot Transformation of Technical Lignins into Humic-Like Plant Stimulants through Fenton-Based Advanced Oxidation: Accelerating Natural Fungus-Driven Humification
    Jeong H.J., Cha J.-Y., Choi J.H., Jang K.-S., Lim J., Kim W.-Y., Seo D.-C., Jeon J.-R.,
    ACS Omega, 2018, 3 (7), pp 7441-7453, doi:10.1021/acsomega.8b00697
  • Synthesis and chemical composition analysis of protocatechualdehyde-based novel melanin dye by 15T FT-ICR: High dyeing performance on soft contact lens
    Jeong H.J., Cha J.-Y., Choi J.H., Jang K.-S., Lim J., Kim W.-Y., Seo D.-C., Jeon J.-R.,
    ACS Omega, 2018, 3 (7), pp 7441-7453, doi:10.1021/acsomega.8b00697
  • Characterization of molecular composition of bacterial melanin isolated from streptomyces glaucescens using ultra-high-resolution FT-ICR mass spectrometry
    Choi M., Choi A.Y., Ahn S.-Y., Choi K.-Y., Jang K.-S.,
    Mass Spectrometry Letters, 2018, 9 (3), pp 81-85, doi:10.5478/MSL.2018.9.3.81
  • Chemical characterization of dissolved organic matter in moist acidic tussock tundra soil using ultra-high resolution 15T FT-ICR mass spectrometry
    Jung Hoon ChoiYun-Gon KimYoo Kyung LeeSeung Pil PackJi Young Jung, Kyoung-Soon Jang,
    Biotechnology and Bioprocess Engineering, 22(5), 637–646 (2017), doi: 10.1007/s12257-017-0121-4
  • Fungal Laccase-Catalyzed Oxidation of Naturally Occurring Phenols for Enhanced Germination and Salt Tolerance of Arabidopsis thaliana: A Green Route for Synthesizing Humic-like Fertilizers
    Joon-Yung Cha, Tae-Wan Kim, Jung Hoon Choi, Kyoung-Soon Jang, Laila Khaleda, Woe-Yeon Kim, and Jong-Rok Jeon,
    J. Agric. Food Chem., 2017, 65 (6), pp 1167–1177, doi: 10.1021/acs.jafc.6b04700
  • In-depth compositional analysis of water-soluble and -insoluble organic substances in fine (PM2.5) airborne particles using ultra-high-resolution 15T FT-ICR MS and GC×GC-TOFMS
    Jung Hoon Choi, Jijeong Ryu, Sodam Jeon, Jungju Seo, Yung-Hun Yang, Seung Pil Pack, Sungwook Choung, Kyoung-Soon Jang
    Environmental Pollution 225, 329-337 (2017), doi: 10.1016/j.envpol.2017.02.058
  • Structural elucidation of nitrogen-containing compounds in polar fractions using double bond equivalence distributions and hydrogen–deuterium exchange mass spectra
    Eunkyoung Kim, Eunji Cho, Arif Ahmed, Young Hwan Kim, Sunghwan Kim
    Fuel 194, 503-510 (2017), doi: 10.1016/j.fuel.2017.01.012
  • Optimization and application of atmospheric pressure chemical and photoionization hydrogen–deuterium exchange mass spectrometry for speciation of oxygen-containing compounds
    Thamina Acter, Donghwi Kim, Arif Ahmed, Jang Mi Jin, Un Hyuk Yim, Won Joon Shim, Young Hwan Kim Email author, Sunghwan Kim
    Analytical and Bioanalytical Chemistry 408, 3281-3293 (2016), doi: 10.1007/s00216-016-9399-x
  • Quantitative mass spectrometric analysis of glycoproteins combined with enrichment methods
    Yeong Hee Ahn, Jin Young Kim, Jong Shin Yoo
    Mass Spectrometry Reviews 34, 148-165 (2015), doi: 10.1002/mas.21428
  • Combination of ring type HPLC separation, ultrahigh-resolution mass spectrometry, and high field NMR for comprehensive characterization of crude oil compositions
    Daae Kim, Jang Mi Jin, Yunju Cho, Eun-Hee Kim, Hae-Kap Cheong, Young Hwan Kim, Sunghwan Kim
    Fuel 157, 48-55 (2015), doi: 10.1016/j.fuel.2015.04.061