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>&l...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><span><span style="font-family:;" "="">as</span></span></span><span><span><span style="font-family:;" "=""> prepared by using a simple and inexpensive technique </span></span></span><span><span><span style="font-family:;" "="">(</span></span></span><span><span><span style="font-family:;" "="">hydrothermal method</span></span></span><span><span><span style="font-family:;" "="">)</span></span></span><span><span><span style="font-family:;" "=""> without a template. Various confirmatory tests were performed to characterize SnO<sub>2</sub> nanoparticles such as energy</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "="">dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Scan<span>ning Electron Microscopy (SEM) and Transition Electron Microscopy</span> (TEM), during the detection of the gas, we found that p</span></span></span><span style="font-family:Verdana;"></span><span><span><span style="font-family:;" "="">ure SnO<sub>2</sub> nanoparticles ha</span></span></span><span><span><span style="font-family:;" "="">s</span></span></span><span><span><span style="font-family:;" "=""> a high selectivity for ethanol to 100 ppm at a low temperature (180</span></span></span><span><span><span style="font-family:;" "="">°C<span>) and a high response (about 27</span></span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "="">s) and a low detection limit of 5 ppm, also it<span style="color:red;"> </span>h</span></span></span><span><span><span style="font-family:;" "="">ave</span></span></span><span><span><span style="font-family:" color:red;"=""> </span></span></span><span><span><span style="font-family:;" "="">response/recovery times about (4</span></span></span><span><span><s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><span><span style="font-family:;" "="">as</span></span></span><span><span><span style="font-family:;" "=""> prepared by using a simple and inexpensive technique </span></span></span><span><span><span style="font-family:;" "="">(</span></span></span><span><span><span style="font-family:;" "="">hydrothermal method</span></span></span><span><span><span style="font-family:;" "="">)</span></span></span><span><span><span style="font-family:;" "=""> without a template. Various confirmatory tests were performed to characterize SnO<sub>2</sub> nanoparticles such as energy</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "="">dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Scan<span>ning Electron Microscopy (SEM) and Transition Electron Microscopy</span> (TEM), during the detection of the gas, we found that p</span></span></span><span style="font-family:Verdana;"></span><span><span><span style="font-family:;" "="">ure SnO<sub>2</sub> nanoparticles ha</span></span></span><span><span><span style="font-family:;" "="">s</span></span></span><span><span><span style="font-family:;" "=""> a high selectivity for ethanol to 100 ppm at a low temperature (180</span></span></span><span><span><span style="font-family:;" "="">°C<span>) and a high response (about 27</span></span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "="">s) and a low detection limit of 5 ppm, also it<span style="color:red;"> </span>h</span></span></span><span><span><span style="font-family:;" "="">ave</span></span></span><span><span><span style="font-family:" color:red;"=""> </span></span></span><span><span><span style="font-family:;" "="">response/recovery times about (4</span></span></span><span><span><s
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.
