room temperature ammonia sensing properties of w18o49 nanowires

... www.elsevier.com/locate/snb Room temperature ammonia sensing properties of W 18 O 49 nanowires Y.M. Zhao, Y.Q. Zhu ∗ Nanotubes Laboratory, Division of Materials, Mechanics and Structures, Faculty of Engineering, ... stability of a single nanowire. Most of the studies are based on films sensors comprising of nanowires. Room temper- ature detections of low concentrat...

Ngày tải lên: 20/03/2014, 13:07

... is known a specific surface area of the sensing film is decreased with increase of grain size [1]. So, the grain growth of the sensing film induces low sensitivity of the sensor. On the other hand, ... et al., Gas sensing properties of WO 3 doped rutile TiO 2 thick film at high operating temperature, Curr. Appl. Phys. (2009), doi:10.1016/j.cap.2009.0 6.053 Fig. 1. SEM images o...

Ngày tải lên: 19/03/2014, 16:48

... material and gas -sensing properties of room- temperature tungsten oxide nanorod sensors Yong Shin Kim ∗ Department of Applied Chemistry, Hanyang University, Ansan 426-791, Republic of Korea article ... dependence of their material and gas -sensing properties on thermal treatment conditions. The thermal treat- ments were performed with the variation of annealing temperatur...

Ngày tải lên: 20/03/2014, 13:11

... Investigation of capacitive humidity sensing behavior of silicon nanowires Huilin Li, Jian Zhang à , BaiRui Tao, LiJuan Wan, WenLi Gong Department of Electronic Engineering, State Key Laboratory of Transducer ... the variation of e r and lead to the change of the capacitance since the relative dielectric constant of water ($60) is larger than that of the air ($1). 2.3. Sys...

Ngày tải lên: 16/03/2014, 15:18

... Structures and electronic properties of Si nanowires grown along the [110] direction: Role of surface reconstruction Toru Akiyama * , Kohji Nakamura, Tomonori Ito Department of Physics Engineering, ... effect of surface reconstruction could be crucial on the electronic proper- ties of thin NWs. In this paper, effects of surface reconstruction on structural and electronic prop...

Ngày tải lên: 16/03/2014, 15:37

... stability is of signi®cance to apply the sensors to certain control and monitoring. 3.3. Gas -sensing properties In this study, we ®rst examined the eect of calcining temperature on gas -sensing properties ... eect of operating temperature from 175°C to 225°C on re- sistance of WO 3 sensor is smaller than that of the other temperatures. So that sensor's resistance c...

Ngày tải lên: 19/03/2014, 16:48

... Actuators B 67 2000 270–274 271 Fig. 1. Change of gas sensitivity with firing temperature. This paper described the effect of NH on gas sensing 3 properties of Pt dispersed-TiO derived from precursor. 2 2. ... medium of Ti and Pt. Then, an excess amount of water was added to hydrolyze the residual alkoxy groups Ž.Ž. of Ti O-iPr AcAc . The amount of platinum salt was 22 adj...

Ngày tải lên: 19/03/2014, 16:48

... range of 30–150 nm. The gas sensing properties of these powders in the form of thick film were investigated with and without platinum doping. Gas response of thick films sintered at two different temperatures ... uniform temperature distribution throughout the sensor elements, they were heated to targeted temperature in dry air for 1 h before measurements were carried out. Gas...

Ngày tải lên: 19/03/2014, 16:48

... energetic levels are the source of added support of charge that changes the sensing properties of the WO 3 -based sensors. 4. Conclusions The gas sensing properties of pure and indium-doped nanoparticle ... size of active layers is one of the key factors to enhance the gas sensing properties of semiconductor metal oxide sensors [7,8]. Additionally, the inclusion of...

Ngày tải lên: 19/03/2014, 16:48

... function of operating temperature of the PtO 2 -doped SnO 2 sensors with varying PtO 2 doping content. Please cite this article in press as: N. Van Hieu, et al., Gas -sensing properties of tin oxide ... vary for heat-treating temperature rang- ing from 500 to 700 ◦ C. Actually, we have already investigated the gas -sensing properties of blank SnO 2 films heat-treated at these...

Ngày tải lên: 19/03/2014, 16:48