Abstract
Ag-LaFeO3 molecularly imprinted polymers (ALMIPs) were fabricated, which provided special recognition sites to methanol. Then ALMIPs fiber 1, fiber 2 and fiber 3 were prepared using filter paper, silk and carbon fibers template, respectively. Based on the observation of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and Nitrogen adsorption surface area analyzer (BET), the structure, morphology and surface area of the fibers were characterized. The ALMIPs fibers (fiber 1, fiber 2 and fiber 3) show excellent selectivity and good response to methanol. The responses to 5 ppm methanol and the optimal operating temperature of ALMIPs fibers are 23.5 and 175 °C (fiber 1), 19.67 and 125 °C (fiber 2), 17.59 and 125 °C (fiber 3), and a lower response (≤10, 3, 2) to other test gases including formaldehyde, acetone, ethanol, ammonia, gasoline and benzene was measured, respectively.
Highlights
Gas sensor is based on the change of conductivity of gas-sensing materials after adsorbing target gas, so it can measure the concentration of the target gas
Han et al reported that the response to 100 ppm methanol of Ce-doped In2O3 porous nanospheres prepared with hydrothermal method is about 35 at operating temperature 325 °C21
Formaldehyde was used as a template molecule, acrylamide (AM) was used as a functional monomer and Ag-LaFeO3 was used as a cross-linker acquire high response and selective formaldehyde gas sensor[25]
Summary
Received: 11 July 2017 Accepted: 6 September 2017 Published: xx xx xxxx imprinted Ag-LaFeO3 fibers. To investigate the gas-sensing properties of ALMF-1, ALMF-2 and ALMF-3, the response of 5 ppm toluene, ammonia, acetone, gasoline and methanol were tested under different operating temperatures (Fig. 6a–c). The cellulose structure and small lattice spacing of material could transport the electrons formed from the gas-sensing reaction, enhanced the carrier mobility of the sensor, result in lower operating temperature[33]. Response 9.5 (20 ppm) 8.5 (10 ppm) 35.2 (100 ppm) 35 (100 ppm) 2.5 (50 ppm) 9.6 (100 ppm) 25 (10 ppm) 7 (50 ppm) 7 (10 ppm) 10.5 (50 ppm) 70 (5000 ppm) 59 (50 ppm) 15 (10 ppm) 6.4 (100 ppm) 1.79 (500 ppm) 24 (100 ppm) 146.6 (400 ppm) 10 (10 ppm) 96 (100 ppm) 0.12 (500 ppm) 23.5 (5 ppm) 19.67 (5 ppm) 17.59 (5 ppm)
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