• 제목/요약/키워드: field emission properties

검색결과 864건 처리시간 0.033초

수열합성법에 의해 성장된 ZnO 나노와이어의 전계방출 특성 (Field Emission Characteristics of ZnO Nanowires Grown by Hydrothermal Method)

  • 노임준;김성현;신백균
    • 조명전기설비학회논문지
    • /
    • 제24권2호
    • /
    • pp.101-105
    • /
    • 2010
  • 본 논문은 수열합성법에 의해 합성된 ZnO 나노와이어의 전계방출 특성을 연구하였다. ZnO 나노와이어는 핫플레이트 위에서 90[$^{\circ}C$]의 온도로 Au 박막위에서 합성되었으며, ZnO 나노와이어의 팁을 형성하기 위한 캡핑 재료로 SDS(Sodium Dodecyl Sulfate)를 0.05~0.3[wt%] 용액에 혼합하였다. 2시간동안 수열합성후 체인 형태의 ZnO 나노와이어가 성장되었다. 고순도의 ZnO 나노와이어는 울자이트(Wurzite) 구조의 팁 형태를 보였으며, ZnO 나노와이어의 전계방출 특성은 고진공 챔버에서 측정하였고, 나노와이어의 턴-온 전계는 0.1[${\mu}A/cm^2$]의 전류밀도에서 4.1V/${\mu}m$]를 나타내었다.

DLC Emitter 전기적 특성 (Electric properties of DLC Emitter)

  • 이상헌
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2009년도 제40회 하계학술대회
    • /
    • pp.1312_1313
    • /
    • 2009
  • In this study the fabrication technique of the planner field emission device structure with a DLC layer were studied. The bottom Mo electrode using electrochemical method on the DLC layer deposited using assist sputtering.

  • PDF

Electronic Spectroscopy and Ligand Field Analysis of cis-$>[Cr(cycb)Cl_2]$Cl

  • Choi, Jong-Ha;Oh, In-Gyung;Subodh Kumar;Ryoo, Keon-Sang
    • Journal of Photoscience
    • /
    • 제11권1호
    • /
    • pp.19-23
    • /
    • 2004
  • The sharp-line absorption spectrum of microcrystalline samples of cis-[Cr(cycb)$Cl_2$]Cl (cycb=rac-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) has been measured between 13000 and $16000 cm^{-1}$ at temperatures down to 5K. The 77K emission and excitation spectra, and 298 K infrared and visible absorption spectra have also been measured. The nine electronic bands due to spin-allowed and spin-forbidden transitions were assigned. Using the observed transitions, a ligand field analysis has been performed to probe the ligand field properties of coordinated atoms in the title chromium(III) complex. The zero-phonon line in the sharp-line absorption spectrum splits into two components by $240 cm^{-1}$ , and the $large ^2$$_E{g}$ splitting can be reproduced by the modem ligand field theory. It is confirmed that nitrogen atoms of the macrocyclic cycb ligand have a strong $\sigma$-donor character, but chloride ligand has weak $\sigma$- nd $\pi$-donor properties toward chromium(III) ion.n.

  • PDF

OPTICAL SPECTROSCOPY AND LIGAND FIELD PARAMETERS OF CIS-DIBROMO(1,4,8,11-TETRAAZACYCLOTETRADECANE) CHROMIUM(III) BROMIDE

  • Choi, Jong-Ha
    • Journal of Photoscience
    • /
    • 제4권3호
    • /
    • pp.121-125
    • /
    • 1997
  • The 77 K emission and excitation, and room-temperature visible spectra of cis[Cr(cyclam)Br$_2$]Br (cyclam=1,4,8,11-tetraazacyclotetradecane) are reported. The mid- and far-infrared spectra at room-temperature are also measured. The vibrational intervals of the electronic ground state are extracted from the far-infrared and emission spectra. The ten electronic bands due to spin-allowed and spin-forbidden transitions are assigned. It is found that nitrogen atoms of the cyclam ligand have strong $\sigma$-donor characters, but bromide ligand has weak $\sigma$- and $\pi$-donor properties toward chromium(III) ion. The zerophonon line in the excitation spectrum splits into two components by 172 cm$^{2-}$, and the large $^2E_g$ splitting can be reproduced by the ligand field theory.

  • PDF