Nanostructured DNA-Templated Polyimidazole Nanowires for Volatile Organic Compounds Sensors
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This research paper presents the synthesis of polyimidazole deoxynucleic acid, templated (Plm/DNA) nanowires through a simple wet chemical method and measuring their potentials for volatile organic compounds (VOCs) sensing at room temperature. Conductive polymers (CP) like imidazole and their derivatives have continuously been used as active layers in chemical gas sensors. Even though lots of researches have been conducted on the potential application of CP as gas sensor, more investigations needs to be carried out in order to explore many of their suitable properties for application in gas sensing Templating CP with DNA have proving to be a method of improving their electrical capabilities and subsequent application in nanosensor. The sensor response shows a linear relationship with VOCs gas concentration. Chloroform and hexane take the longest time (105 s)to respond and the least response time of 73 Secs and faster recovery (49 Secs) were observed for methanol while ethanol (89 Secs) has the longest recovery time among the analytes. Generally, all the analytes have a response ratio in the range of 0.72 – 1.02, which is an indication of good response/repeatability. Methanol (0.99) has a low but consistent baseline for the Plm/DNA nanowires. The highest baseline drift value (>1) was observed in acetone, chloroform and ethanol. The remaining analytes have lower values that are lower than 50. The observed VOCs gas-sensing response to Plm/DNA nanocomposite sensor have shown higher repeatability, selectivity, long-term stability, and fast response-recovery characteristics which is a step forward toward their applicability in environmental monitoring sensor and nanoelectronics industry.implications for the field.
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