Ultrasensitive Gold Nanostar鈥揚olyaniline Composite for Ammonia Gas Sensing

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• 作者：Vished Kumar ; Vithoba Patil ; Amey Apte ; Namdev Harale ; Pramod Patil ; Sulabha Kulkarni
• 刊名：Langmuir
• 出版年：2015
• 出版时间：December 8, 2015
• 年：2015
• 卷：31
• 期：48
• 页码：13247-13256
• 全文大小：601K
• ISSN：1520-5827

文摘

Gold in the form of bulk metal mostly does not react with gases or liquids at room temperature. On the other hand, nanoparticles of gold are very reactive and useful as catalysts. The reactivity of nanoparticles depends on the size and the morphology of the nanoparticles. Gold nanostars containing copper have rough surfaces and large numbers of active sites due to tips, sides, corners, and large surface area-to-volume ratios due to their branched morphology. Here the sensitivity of the gold nanostar鈥損olyaniline composite (average size of nanostars 鈭?70 nm) toward ammonia gas has been investigated. For 100 ppm ammonia, the sensitivity of the composite increased to 52% from a mere 7% value for pure polyaniline. The gold nanostar鈥損olyaniline composite even showed a response time as short as 15 s at room temperature. The gold nanostars act as a catalyst in the nanocomposite. The stability and sensitivity at different concentrations and the selectivity for ammonia gas were also investigated.