To observation, poisonous gases in the environment, Sensors with high selectivity, high response and low operating temperature are required. In this work, pure SnO<sub>2</sub> nanoparticles w<span style...To observation, poisonous gases in the environment, Sensors with high selectivity, high response and low operating temperature are required. In this work, pure SnO<sub>2</sub> nanoparticles w<span style="font-family:;" "="">as<span style="font-family:;" "=""> prepared by using a simple and inexpensive technique <span style="font-family:;" "="">(<span style="font-family:;" "="">hydrothermal method<span style="font-family:;" "="">)<span style="font-family:;" "=""> without a template. Various confirmatory tests were performed to characterize SnO<sub>2</sub> nanoparticles such as energy<span style="font-family:;" "=""> <span style="font-family:;" "="">dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Transition Electron Microscopy (TEM), during the detection of the gas, we found that p<span style="font-family:Verdana;"><span style="font-family:;" "="">ure SnO<sub>2</sub> nanoparticles ha<span style="font-family:;" "="">s<span style="font-family:;" "=""> a high selectivity for ethanol to 100 ppm at a low temperature (180<span style="font-family:;" "="">°C) and a high response (about 27<span style="font-family:;" "=""> <span style="font-family:;" "="">s) and a low detection limit of 5 ppm, also it<span style="color:red;"> h<span style="font-family:;" "="">ave<span style="font-family:" color:red;"=""> <span style="font-family:;" "="">response/recovery times about (4<span style="font-family:;" "=""> <span style="font-family:;" "="">s, 2<span style="font-family:;" "=""> <span style="font-family:;" "="">s) respectively. The distinctive sensing properties of SnO<sub>2</sub> sensor make it a promising candidate for ethanol detection. Furthermore, the gas-sensing mechanism have been examined.展开更多
In this work, we’ve made SnO<sub>2</sub> flower formed with the aid of using easy test steps, and without cost, which is the hydrothermal approach and without a template. We have used a variety of techniq...In this work, we’ve made SnO<sub>2</sub> flower formed with the aid of using easy test steps, and without cost, which is the hydrothermal approach and without a template. We have used a variety of techniques to characterize SnO<sub>2</sub> flower-shaped by (SEM, TEM, XRD, BET and XPS) instruments. Confirmatory tests carried out have proven that the surface of the tetragonal structure of SnO<sub>2</sub> has a rough surface which makes it excellent for its gas-sensing properties. The gas detection test of SnO<sub>2</sub> flower-shaped proved that it possesses the selectivity of formaldehyde gas (about 30), the optimum operating temperature of the sensor is 220<span style="white-space:nowrap;"><span style="white-space:nowrap;">°</span></span>C, and also the sensor has a high response time and recovery time is (5 s and 22 s) to 100 ppm, respectively. Particularly, the sensor has an obvious response value (2) when exposed to 5 ppm formaldehyde. As well, the mechanism of gas-sensing was also discussed.展开更多
文摘To observation, poisonous gases in the environment, Sensors with high selectivity, high response and low operating temperature are required. In this work, pure SnO<sub>2</sub> nanoparticles w<span style="font-family:;" "="">as<span style="font-family:;" "=""> prepared by using a simple and inexpensive technique <span style="font-family:;" "="">(<span style="font-family:;" "="">hydrothermal method<span style="font-family:;" "="">)<span style="font-family:;" "=""> without a template. Various confirmatory tests were performed to characterize SnO<sub>2</sub> nanoparticles such as energy<span style="font-family:;" "=""> <span style="font-family:;" "="">dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Transition Electron Microscopy (TEM), during the detection of the gas, we found that p<span style="font-family:Verdana;"><span style="font-family:;" "="">ure SnO<sub>2</sub> nanoparticles ha<span style="font-family:;" "="">s<span style="font-family:;" "=""> a high selectivity for ethanol to 100 ppm at a low temperature (180<span style="font-family:;" "="">°C) and a high response (about 27<span style="font-family:;" "=""> <span style="font-family:;" "="">s) and a low detection limit of 5 ppm, also it<span style="color:red;"> h<span style="font-family:;" "="">ave<span style="font-family:" color:red;"=""> <span style="font-family:;" "="">response/recovery times about (4<span style="font-family:;" "=""> <span style="font-family:;" "="">s, 2<span style="font-family:;" "=""> <span style="font-family:;" "="">s) respectively. The distinctive sensing properties of SnO<sub>2</sub> sensor make it a promising candidate for ethanol detection. Furthermore, the gas-sensing mechanism have been examined.
文摘In this work, we’ve made SnO<sub>2</sub> flower formed with the aid of using easy test steps, and without cost, which is the hydrothermal approach and without a template. We have used a variety of techniques to characterize SnO<sub>2</sub> flower-shaped by (SEM, TEM, XRD, BET and XPS) instruments. Confirmatory tests carried out have proven that the surface of the tetragonal structure of SnO<sub>2</sub> has a rough surface which makes it excellent for its gas-sensing properties. The gas detection test of SnO<sub>2</sub> flower-shaped proved that it possesses the selectivity of formaldehyde gas (about 30), the optimum operating temperature of the sensor is 220<span style="white-space:nowrap;"><span style="white-space:nowrap;">°</span></span>C, and also the sensor has a high response time and recovery time is (5 s and 22 s) to 100 ppm, respectively. Particularly, the sensor has an obvious response value (2) when exposed to 5 ppm formaldehyde. As well, the mechanism of gas-sensing was also discussed.
