Photoconduction and the electronic structure of silica nanowires embedded with gold nanoparticles

C. W. Pao, C. T. Wu, H. M. Tsai, Y. S. Liu, C. L. Chang, W. F. Pong, J. W. Chiou, C. W. Chen, M. S. Hu, M. W. Chu, L. C. Chen, C. H. Chen, K. H. Chen, S. B. Wang, S. J. Chang, M. H. Tsai, H. J. Lin, J. F. Lee, J. H. Guo

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Silica nanowires (SiOx-NWs) embedded with Au peapods have been studied by energy-filtered scanning transmission electron microscopy (EFTEM), O K- and Au L3-edge x-ray absorption near-edge structure (XANES), and extended x-ray absorption fine structure (EXAFS), x-ray emission spectroscopy (XES) and scanning photoelectron microscopy. XANES and XES data show that band gaps of Au-peapod-embedded and pure SiOx-NWs were 6.8 eV. In additional, XANES and EXAFS results indicate illumination-induced electron transfer from Au peapod to SiOx-NWs and does not show any feature attributable to the formation of Au-Si bonding in the Au peapod embedded in SiOx-NWs with or without illumination. Photoresponse and EFTEM measurements show that green light has more significant enhancement of photoconductivity than red and blue light due to surface plasmon resonance and suggest that transport of electrons across SiOx-NWs is via Mott-variable-range hopping mechanism through localized or defect states.

Original languageEnglish
Article number165412
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number16
DOIs
Publication statusPublished - 2011 Oct 7

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Photoconduction and the electronic structure of silica nanowires embedded with gold nanoparticles'. Together they form a unique fingerprint.

Cite this