GROWTH TIME DEPENDENCE ON PHOTOELECTROCHEMICAL PROPERTY OF ZINC OXIDE NANORODS PREPARED BY HYDROTHERMAL SYNTHESIS

Prapakorn Rattanawarinchai, Narathon Khemasiri, Sukittaya Jessadaluk, Chanunthorn Chananonnawathorn, Mati Horprathum, Annop Klamchuen, Navaphun Kayunkid, Sakon Rahong, Darinee Phromyothin and Jiti Nukeaw
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Prapakorn Rattanawarinchai: College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand
Narathon Khemasiri: College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand†Thailand Center of Excellence in Physics, Commission on Higher Education, Ministry of Education, Bangkok 10400, Thailand
Sukittaya Jessadaluk: College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand
Chanunthorn Chananonnawathorn: #x2021;National Electronics and Computer Technology Center, National Scienceand Technology Development Agency, Patumthani 12120, Thailand
Mati Horprathum: #x2021;National Electronics and Computer Technology Center, National Scienceand Technology Development Agency, Patumthani 12120, Thailand
Annop Klamchuen: #xA7;National Nanotechnology Center, National Science and Technology Development Agency, Patumthani 12120, Thailand
Navaphun Kayunkid: College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand†Thailand Center of Excellence in Physics, Commission on Higher Education, Ministry of Education, Bangkok 10400, Thailand
Sakon Rahong: College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand†Thailand Center of Excellence in Physics, Commission on Higher Education, Ministry of Education, Bangkok 10400, Thailand¶ImPACT Research Center for Advanced Nanobiodevices, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Darinee Phromyothin: College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand
Jiti Nukeaw: College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand†Thailand Center of Excellence in Physics, Commission on Higher Education, Ministry of Education, Bangkok 10400, Thailand

Surface Review and Letters (SRL), 2018, vol. 25, issue Supp01, 1-7

Abstract: Here, the dependence of growth time on the growth behavior, morphology and photoelectrochemical (PEC) properties of ZnOnanorods (ZnO-NRs) as a photoanode are demonstrated. Vertical-aligned ZnO-NRs with c-axis perpendicular to substrate were accomplished via seed-assisted hydrothermal technique at the growth time varying between 0.5 and 24h. Growth behaviors of ZnO-NRs can be described into three regimes, which consist of the nucleation stage, ZnO-NRs growth and saturation growth, respectively. ZnO nanoparticles (NPs) corresponding to the nucleation site occur at the growth time below 1h. Afterward, the growth regime of ZnO-NRs, which originated from the competition between the vertical and the lateral growth, is clearly observed, and leads to increase in length and diameter. The whole growth of ZnO-NRs is terminated after 16h, attributed to low amount of Zn2+ and OH− supplied from growth solution. PEC measurement reveals the fast solar response and high photostability of ZnO-NRs. Additionally, the photoconversion efficiency (η) improves with the growth time of 4h and degrades for longer time due to the change of total surface area. The maximum η of 0.13% at 0.63VRHE is obtained for the growth time of 4h. Our results highlight that the growth time plays a crucial role in controlling growth behavior and the total surface area directly related with the PEC properties of ZnO-NRs.

Keywords: Zinc oxide nanorods (ZnO-NRs); seed-assisted hydrothermal technique; photoelectrochemical (PEC); water splitting (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X18400012

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