TAILIEUCHUNG - Ethanol vapor sensing properties of Zno/Cuo nanocomposites

The results showed that the composite of 30 wt% CuO/70 wt% ZnO exhibited the highest response to ethanol vapor at an optimum temperature of 375 oC. | Journal of Science and Technology 54 (1A) (2016) 120-128 ETHANOL VAPOR SENSING PROPERTIES OF ZnO/CuO NANOCOMPOSITES Do Duc Tho*, Bui Anh Tuan, Luong Huu Phuoc, Nguyen Duc Chien, Dang Duc Vuong School of Engineering Physics, Hanoi University of Science and Technology, 1- Dai Co Viet, Ha Noi * Email: Received: 15 June 2015; Accepted for publication: 26 October 2015 ABSTRACT CuO leaf-like with thickness of 20 nm, and ZnO plates with thickness of 40 nm have been successfully prepared through a wet chemical method. The two materials were mixed with different weight ratios (CuO/ZnO) to produce nanocomposite materials. Ethanol vapor sensing properties of films derived from obtained materials on SiO2/Si substrates attached with Pt interdigitated electrodes were investigated at operating temperatures in the range of 250 C – 400 C and ethanol vapor concentration in the range of 125 - 1500 ppm. The results showed that the composite of 30 wt% CuO/70 wt% ZnO exhibited the highest response to ethanol vapor at an optimum temperature of 375 oC. Keywords: ZnO nanoplates, leaf-like CuO, nanocomposites, sensor. 1. INTRODUCTION ZnO is a traditional n-type semiconductor due to the existence of oxygen vacancies. ZnO nanostructures with wide, direct bandgap ( eV, at 300 K) and a large free exciton binding energy (60 meV) have attracted intense research interest due to their morphologies and potential optical and electrical applications, such as field emitter [1], ultraviolet laser [2], biosensor [3], gas sensor [4 - 13] and UV devices [14 – 19]. In contrast, CuO is a p-type transition-metal oxide semiconductor with a narrow bandgap ( eV). Their nanostructures have been extensively studied in recent years and have been considered as promising materials in many fields such as gas sensors [20], lithium ion electrode materials [21] and field emission emitters [22]. Composite nanostructures of ZnO and CuO may form a p-n junction in low dimensional scale. It is

• Hoá học
• Journal of Science and Technology
• Ethanol vapor sensing properties
• Zno Cuo nanocomposites
• CuO leaf like
• Traditional n type semiconductor due
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