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Effect of silver nanowire dimension to ammonia adsorption of graphene-silver nanowires hybrid

In this report, we study the effect of silver nanowires (AgNws) dimension to electrical properties of rGO/AgNws hybrid. The alteration of these electrical properties leads the difference of ammonia sensibility of the rGO/AgNws hybrid based sensing devices. When the rGO is accompanied by AgNws of different sizes from ∼ 500 nm to > 10 µm, the ammonia sensitivity of these hybrids change from 60% to 340% alteration compared with the bare rGO material. | Communications in Physics, Vol. 24, No. 3S1 (2014), pp. 113-120 DOI:10.15625/0868-3166/24/3S1/5237 EFFECT OF SILVER NANOWIRE DIMENSION TO AMMONIA ADSORPTION OF GRAPHENE-SILVER NANOWIRES HYBRID HUYNH TRAN MY HOA, HOANG THI THU, LA PHAN PHUONG HA, LE HA PHUONG, AND TRAN QUANG TRUNG Faculty of Physics, University of Science, Vietnam National University, Ho Chi Minh City NGUYEN VAN THUAN AND NGUYEN NANG DINH University of Engineering and Technology, Vietnam National university, Hanoi PHAN MINH HANH United Vietnam Photonics. Lot I3 N2 Street Sai-Gon High Tech Part District 9, Ho Chi Minh City E-mail: tqtrung@hcmus.edu.vn Received 04 April 2014 Accepted for publication 24 May 2014 Abstract. In this report, we study the effect of silver nanowires (AgNws) dimension to electrical properties of rGO/AgNws hybrid. The alteration of these electrical properties leads the difference of ammonia sensibility of the rGO/AgNws hybrid based sensing devices. When the rGO is accompanied by AgNws of different sizes from ∼ 500 nm to > 10 µm, the ammonia sensitivity of these hybrids change from 60% to 340% alteration compared with the bare rGO material. Keywords: reduced graphene oxide, Hummers method, silver nanowires, polyol method, NH3 gas sensing. I. INTRODUCTION Graphene is an allotrope of carbon and constructed by a single two-dimensional (2D) layer of sp2 hybridized carbon atoms and has many excellent electrical properties. As a result, Graphene and related materials, such as Graphene Oxide (GO) and reduced Graphene Oxide (rGO), have demonstrated significant potential as materials for chemical sensing because of their 2-dimensional structure results in a high sensing area per unit volume and the low noise compared to other solid state sensors. Many research groups have reported the use of graphene or graphitic materials for detecting gases and vapors [1, 2]. Especially, some of the articles attempted to connect the advantages of nanoscale metals with that of graphene for improving