• 제목/요약/키워드: college of science-engineering

검색결과 10,196건 처리시간 0.043초

Facile Synthesis of CdTe Nanorods from the Growth of Te Nanorods

  • Xu, Weiwei;Niu, Jinzhong;Zheng, Shuang;Tian, Guimin;Wu, Xinghui;Cheng, Yongguang;Hu, Xiaoyang;Liu, Shuaishuai;Hao, Haoshan
    • 대한화학회지
    • /
    • 제61권4호
    • /
    • pp.185-190
    • /
    • 2017
  • One-dimensional CdTe nanorods (NRs) are obtained by the reaction of various Cd precursors with single crystalline Te nanorod templates, which are pre-synthesized from Te precursors by a simple and reproducible solvothermal method. Throughout the process, the diffraction intensity of different crystal facets of single crystalline Te NRs varied with reaction times. Finally, by alloying Cd ions along the axial direction of Te NRs, polycrystalline cubic phase CdTe NRs with diameters of 80-150 nm and length up to $1.2-2.4{\mu}m$ are obtained. The nucleation and growth processes of Te and CdTe NRs are discussed in details, and their properties are characterized by XRD, SEM, TEM, Raman scattering, and UV-vis absorption spectra. It was found that the key elements of synthesizing CdTe NRs such as reaction temperatures and Cd sources will strongly influence the final shape of CdTe NRs.

플라스틱 광섬유를 이용한 호흡센서의 개발 (Development of a Respiration Sensor Using Plastic Optical Fiber)

  • 유욱재;백지윤;조동현;장경원;서정기;허지연;이봉수;조영호;박병기;문주현
    • 대한의용생체공학회:의공학회지
    • /
    • 제30권6호
    • /
    • pp.489-494
    • /
    • 2009
  • In this study, we fabricated a plastic optical fiber based sensor which can monitor the respiration of a patient. The circumference changes of the abdomen were measured using a mirror, a light source and optical detectors because the circumferences of the abdomen could be varied with respiration. The intensity of the reflected lights were measured according to the changes of distance between mirror and plastic optical fiber connected to a light source and a photodiode-amplifier system using a Y-coupler. The respiration signals of fiber-optic sensor system were compared with those of the respiratory and temperature transducers of the $BIOPAC^{(R)}$ system. It is expected that a fiber-optic respiration sensor could be developed for real time respiration monitoring during MRI procedure based on this study.

1차원 광섬유 팬텀선량계를 이용한 치료용 광자선의 피부 및 선량보강영역에서 상대선량 측정 (Measurement of Relative Depth dose of Therapeutic Photon Beam Using One-Dimensional Fiber-Optic Phantom Dosimeter)

  • 문진수;장경원;유욱재;서정기;박장연;조영호;이봉수
    • 센서학회지
    • /
    • 제20권2호
    • /
    • pp.96-101
    • /
    • 2011
  • In this study, we fabricated a fiber-optic phantom dosimeter by arraying square type of plastic optical fibers in a PMMA phantom for measuring relative depth doses of therapeutic photon beams. To minimize the cross-talk between fiber-optic dosimeters, we selected appropriate septum by measuring leaked scintillating lights according to the various kinds of septa. In addition, we measured percentage depth doses of 6, 15 MV photon beams using a fiber-optic phantom dosimeter.