Mesoporous nickel cobalt hydroxide/oxide as an excellent room temperature ammonia sensor

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• 作者：Alfa Sharma^a ; Prateek Bhojane^a ; Amit Kumar Rana^b ; Yogendra Kumar^a ; Parasharam M. Shirage^a ; ^b ; ^{paras.shirage@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; ^{pmshirage@iiti.ac.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：RT ammonia sensor ; Mesoporous ; SEM ; BET ; Ni-Co hydroxide/oxide
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：128
• 期：Complete
• 页码：65-68
• 全文大小：572 K

文摘

We report an excellent room temperature NH₃ gas sensing performance using highly mesoporous nanoflakes of Ni-Co hydroxide/Oxide synthesised by facile and economical wet chemical method. The dynamic sensing of NiCo₂(OH)₆(NCH) and NiCo₂O₄ (NCO) shows nearly 3 and 2 fold increase in sensitivity by varying NH₃ concentrations demonstrating excellent sensitivity which is in accordance to Freundlich equation. The interesting behaviour of NCO being p–type material spectacles n-type gas sensing behaviour towards low ammonia concentration at RT. The anomalous sensing response is ascribed to transition of majority charge carriers due to surface reaction of chemisorbed oxygen ions and ammonia gas vapours.