Narayana Ashwath, Bhat Sachin A, Fathima Almas, Lokesh S V, Surya Sandeep G, Yelamaggad C V
Department of Bio-Medical Engineering, Rajiv Gandhi Institute of Technology Cholanagar, R. T Nagar, Hebbal Bengaluru India.
Centre for Nano and Soft Matter Sciences P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru India
RSC Adv. 2020 Apr 2;10(23):13532-13542. doi: 10.1039/d0ra00478b. eCollection 2020 Apr 1.
There has been steady progress in developing reliable and cost-effective strategies for the clean production of zinc oxide (ZnO) nanoparticles (NPs) owing to their unique structural and wide functional characteristics. While the green synthesis of such NPs from plant extracts has emerged as a sustainable and eco-friendly protocol, it is greatly restricted owing to the scarcity of potential natural precursors necessitating comprehensive investigations in this direction. Herein, we report a facile, low-cost green synthesis and characterization of ZnO NPs along with the demonstration of their usage as an active media in organic field-effect transistor (OFET) devices for sensing carbon monoxide (CO) gas. The ZnO NPs obtained from (lotus) leaf extract-mediated solution combustion synthesis at a much lower initiation temperature, the first of its kind, were characterized by various techniques such as UV-vis spectroscopy, XRD, EDX analysis, TEM and FESEM. The data derived from these experiments clearly evidence the formation of very pure and crystalline ZnO NPs possessing nearly spherical-shape with a size of 3-4 nm. The p-type organic field-effect transistor (OFET) device, fabricated using poly(3-hexylthiophene-2,5-diyl) (P3HT) and ZnO NPs, showed a field-effect mobility of 10 cm V sec with a slightly enhanced response of detecting CO gas at room temperature (RT). The phenomenon was further confirmed by the variation in electrical parameters of the OFET such as field-effect mobility (), on-current ( ), and off-current ( ). The selectivity and sensitivity of the fabricated device in CO gas detection was found to be more prominent than the other reducing gases (hydrogen sulphide, HS and ammonia, NH) and methanol vapours tested.
由于氧化锌（ZnO）纳米颗粒（NPs）独特的结构和广泛的功能特性，在开发可靠且具有成本效益的氧化锌纳米颗粒清洁生产策略方面取得了稳步进展。虽然从植物提取物中绿色合成此类纳米颗粒已成为一种可持续且环保的方案，但由于潜在天然前体的稀缺，该方法受到极大限制，因此有必要在这一方向上进行全面研究。在此，我们报告了一种简便、低成本的氧化锌纳米颗粒绿色合成及表征方法，并展示了其作为有机场效应晶体管（OFET）器件中用于检测一氧化碳（CO）气体的活性介质的用途。通过荷叶提取物介导的溶液燃烧合成法在低得多的起始温度下获得的氧化锌纳米颗粒，这是首例此类报道，采用紫外可见光谱、X射线衍射、能谱分析、透射电子显微镜和场发射扫描电子显微镜等多种技术对其进行了表征。这些实验获得的数据清楚地证明形成了非常纯净且结晶的氧化锌纳米颗粒，其形状近乎球形，尺寸为3 - 4纳米。使用聚（3 - 己基噻吩 - 2,5 - 二基）（P3HT）和氧化锌纳米颗粒制造的p型有机场效应晶体管（OFET）器件，场效应迁移率为10 cm² V⁻¹ sec⁻¹，在室温下检测CO气体时响应略有增强。场效应晶体管的电学参数如场效应迁移率（μ）、导通电流（Ion）和截止电流（Ioff）的变化进一步证实了这一现象。在所测试的其他还原气体（硫化氢、H₂S和氨、NH₃）以及甲醇蒸气中，所制造器件在CO气体检测中的选择性和灵敏度更为突出。
