Nanoporous structures on ZnO thin films

GÜR E., Kilic B., Coskun C., TÜZEMEN S., BAYRAKÇEKEN NİŞANCI F.

SUPERLATTICES AND MICROSTRUCTURES, cilt.47, sa.1, ss.182-186, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 47 Sayı: 1
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.spmi.2009.07.003
  • Dergi Adı: SUPERLATTICES AND MICROSTRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.182-186
  • Anahtar Kelimeler: ZnO, Nanoporous structures, SAMs, Optical properties, Electrochemical deposition
  • Eskişehir Osmangazi Üniversitesi Adresli: Hayır

Özet

Porous structures were formed on ZnO thin films which were grown by an electrochemical deposition (ECD) method. The growth processes were carried out in a solution of dimethylsulfoxide (DMSO) zinc perchlorate, Zn(ClO(4))(2), at 120 degrees C on indium tin oxide (ITO) substrates. Optical and structural characterizations of electrochemically grown ZnO thin films have shown that the films possess high (0002) c-axis orientation, high nucleation, high intensity and low FWHM of UV emission at the band edge region and a sharp UV absorption edge. Nanoporous structures were formed via self-assembled monolayers (SAMs) of hexanethiol (C(6)SH) and dodecanethiol (C(12)SH). Scanning electron microscope (SEM) measurements showed that while a nanoporous structure (pore radius 20 nm) is formed on the ZnO thin films by hexanathiol solution, a macroporous structure (pore radius 360 nm) is formed by dodecanethiol solution. No significant variation is observed in X-ray diffraction (XRD) measurements on the ZnO thin films after pore formation. However, photoluminescence (PL) measurements showed that green emission is observed as the dominant emission for the macroporous structures, while no variation is observed for the thin film nanoporous ZnO sample. (C) 2009 Elsevier Ltd. All rights reserved.