Optical switches based on CdS single nanowire

Yi Xi, Chenguo Hu, Chunhua Zheng, Hulin Zhang, Rusen Yang, Yongshu Tian

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

CdS nanowires have been synthesized by a composite-hydroxide-mediated approach. The characterization of the nanowire with X-ray diffraction, scanning electron microscopy, and transmission electron microscopy indicated a single-crystalline hexagonal structure growing along 21̄1̄0 direction with length up to 100 μm. The UV-visible reflection spectrum demonstrated a band gap of 2.36 eV. A strong light emission centered at 543 nm was observed under different excitation wavelengths of 300, 320, 360 and 400 nm, which was further confirmed by a bright fluorescent imaging of a single CdS nanowire. The photocurrent response based on a single CdS nanowire showed distinct optical switch under the intermittent illumination of white light. The rise and decay time were less than 1.0 and 0.2 s, respectively, indicating high crystallization with fewer trap centers in the CdS nanowires. It is possible that the undesirable trapping effects on grain-boundaries for photoconductors could be avoided thanks to the single-crystalline nature of the CdS nanowires.

Original languageEnglish (US)
Pages (from-to)1476-1480
Number of pages5
JournalMaterials Research Bulletin
Volume45
Issue number10
DOIs
StatePublished - Oct 2010

Bibliographical note

Funding Information:
This work is financially supported by the NSFC ( 60976055 ), Postgraduates’ Science and Innovation Fund ( 200801CIA0080267 ) and Innovative Talent Training Project (S-09109) of the 3rd-211 Project, and the large-scale equipment sharing fund of Chongqing University. The authors would like to thank Dr. Yong Ding for his assistance in TEM analysis and Xiaomei Zhang for her assistance in the measurement of PL spectra.

Keywords

  • A. Nanostructures
  • A. Semiconductor
  • B. Chemical synthesis
  • D. Optical properties

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