Sensitivity enhancement of ammonia gas sensor based on Ag/ZnO flower and nanoellipsoids at low temperature

被引：242
作者：
Ganesh, R. Sankar [1 ,2 ]
Navaneethan, M. [2 ,3 ]
Patil, V. L. [4 ]
Ponnusamy, S. [2 ]
Muthamizhchelvan, C. [2 ]
Kawasaki, S. [5 ]
Patil, P. S. [4 ]
Hayakawa, Y. [1 ,3 ]
机构：
[1] Shizuoka Univ, Grad Sch Sci & Technol, Naka Ku, 3-5-1 Johoku, Hamamatsu, Shizuoka 4328011, Japan
[2] SRM Univ, Dept Phys & Nanotechnol, Ctr Mat Sci & Nano Devices, Kanchipuram 603203, Tamil Nadu, India
[3] Shizuoka Univ, Res Inst Elect, Naka Ku, 3-5-1 Johoku, Hamamatsu, Shizuoka 4328011, Japan
[4] Shivaji Univ, Dept Phys, Thin Film Mat Lab, Kolhapur, Maharashtra, India
[5] Nagoya Inst Technol, Dept Mat Sci & Engn, Gokiso Ku, Showa Ku, Nagoya, Aichi 4668555, Japan
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2018年 / 255卷
关键词：
Ammonia; Ag/ZnO Composite; Nanoellipsoids; Nanoflower; BET analysis; STEM; REDUCED GRAPHENE OXIDE; WALLED CARBON NANOTUBE; SENSING PROPERTIES; ZNO NANORODS; SELECTIVE DETECTION; AG; PERFORMANCE; FILM; NANOCOMPOSITES; NANOPARTICLES;
D O I：
10.1016/j.snb.2017.08.015
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
High sensitivity ammonia gas sensor based on Ag/ZnO composite (SZO) nanostructures and their structural, optical, morphological and gas sensing properties were investigated. Field-emission scanning electron microscopy and high-resolution transmission electron microscopy revealed that pure ZnO flower-like nanorods transformed into nanoellipsoids upon adding of silver (Ag). Scanning transmission electron microscopy (STEM) analysis showed clear flower-like morphology of Ag/ZnO composite. STEM-mapping measurement showed that Zn, Ag and O were homogeneously distributed. The ammonia gas sensing analysis revealed that the Ag/ZnO (6 wt%) showed higher gas response compared with other content of Ag wt%. Ag/ZnO (6 wt%) exhibited the highest response of 29.5 when exposed to 100 ppm ammonia gas. Interestingly, Ag/ZnO (6 wt%) possessed good response and recovery property of 13 and 20 s at low concentration of ammonia at 10 ppm, respectively. The mechanism of gas sensing and enhanced gas response of pure ZnO and Ag/ZnO composite was discussed. (C) 2017 Elsevier B.V. All rights reserved.
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页码：672 / 683
页数：12
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