Au-ZnO nanowire films have been synthesized by annealing Zn foils coated with a thin layer of gold. An X-ray diffraction study found that the synthesized ZnO consists mainly of a hexagonal wurtzite structure along with a small amount of AuZn3 phase. Scanning electron images showed that the ZnO wires extend to several microns in length. X-ray photoelectron spectroscopy studies confirmed the oxidation states of Au and Zn. An asymmetric O ls peak indicates the presence of oxygen in an oxide layer and O H groups on the films surfaces. Photoluminescence (PL) spectra showed different visible peaks for pre-annealed films, while for annealed films an UV peak appeared. In addition, the PL analysis showed that the overall intensity of photoluminescence decreased significantly after the films were annealed. Raman spectroscopy results also indicated that the crystalline quality of the films improved with annealing. This could be attributed to a decrease in oxygen vacancies and/or absorption of O-H groups on the surface of ZnO film. The highly hydrophilic surface with a water contact angle of similar to 155 degrees was obtained after annealing in air. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, IndiaIndian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India
Gogurla, Narendar
Bayan, Sayan
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Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, IndiaIndian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India
Bayan, Sayan
Chakrabarty, Poulomi
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Indian Inst Technol, Sch Nanosci & Technol, Kharagpur 721302, W Bengal, IndiaIndian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India
Chakrabarty, Poulomi
Ray, Samit Kumar
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Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India
Indian Inst Technol, Sch Nanosci & Technol, Kharagpur 721302, W Bengal, India
SN Bose Natl Ctr Basic Sci, Kolkata, IndiaIndian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India
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Korea Elect Technol Inst, Energy & Nanomat Res Ctr, Gyeonggi Do 463816, South Korea
Korea Univ, Grad Sch Energy & Environm, Seoul 136713, South KoreaKorea Elect Technol Inst, Energy & Nanomat Res Ctr, Gyeonggi Do 463816, South Korea
Kim, Sung Hyun
Lee, Churl Seung
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Korea Elect Technol Inst, Energy & Nanomat Res Ctr, Gyeonggi Do 463816, South KoreaKorea Elect Technol Inst, Energy & Nanomat Res Ctr, Gyeonggi Do 463816, South Korea
Lee, Churl Seung
Kim, Jeesun
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Stanford Univ, Dept Bioengn, Stanford, CA 94309 USAKorea Elect Technol Inst, Energy & Nanomat Res Ctr, Gyeonggi Do 463816, South Korea
Kim, Jeesun
Cho, Jin Woo
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Korea Elect Technol Inst, Energy & Nanomat Res Ctr, Gyeonggi Do 463816, South KoreaKorea Elect Technol Inst, Energy & Nanomat Res Ctr, Gyeonggi Do 463816, South Korea
Cho, Jin Woo
Kim, Young Keun
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Korea Univ, Dept Mat Sci & Engn, Seoul 136713, South KoreaKorea Elect Technol Inst, Energy & Nanomat Res Ctr, Gyeonggi Do 463816, South Korea
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CI Homi Bhabha Natl Inst, Saha Inst Nucl Phys, 1 AF Bidhannagar, Kolkata 700064, IndiaCI Homi Bhabha Natl Inst, Saha Inst Nucl Phys, 1 AF Bidhannagar, Kolkata 700064, India