Chakrabarty Poulomi, Banik Meneka, Gogurla Narendar, Santra Sumita, Ray Samit K, Mukherjee Rabibrata
School of Nanoscience and Technology, Instability and Soft Patterning Laboratory, Department of Chemical Engineering, and Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India.
ACS Omega. 2019 Jul 12;4(7):12071-12080. doi: 10.1021/acsomega.9b01116. eCollection 2019 Jul 31.
An ordered array of 1D ZnO nanorods obtained by colloidal templating is shown to dramatically enhance the sensing response of NO at room temperature by confining light and creating periodic structures. The sensitivity is measured for a concentration varying from 2 to 10 ppm (response 53% at 10 ppm) at room temperature under white light illumination with ≈225 nm hole diameter. In contrast, structures with ≈450 nm hole size show better sensing under (response 98% at 10 ppm) elevated temperatures in dark conditions, which is attributed to the increased surface chemical interactions with NO molecules due to the porous nature and enhanced accessible surface area of ZnO nanorods. Further, the decoration of ZnO Nanorods with gold nanoparticles shows enhanced sensor performance (response 130% at 10 ppm) due to localized surface plasmon resonance under white light illumination. The findings may lead to new opportunities in the visible light-activated room-temperature NO sensors for healthcare applications.
通过胶体模板法获得的一维ZnO纳米棒有序阵列被证明，通过限制光和创造周期性结构，能在室温下显著增强对NO的传感响应。在室温下，白光照射下，孔径约为225nm时，测量了浓度从2到10ppm范围内的灵敏度（10ppm时响应为53%）。相比之下，孔径约为450nm的结构在黑暗条件下高温时表现出更好的传感性能（10ppm时响应为98%），这归因于ZnO纳米棒的多孔性质和增加的可及表面积，使得与NO分子的表面化学相互作用增强。此外，用金纳米颗粒修饰ZnO纳米棒，由于白光照射下的局域表面等离子体共振，显示出增强的传感器性能（10ppm时响应为130%）。这些发现可能为用于医疗保健应用的可见光激活室温NO传感器带来新机遇。
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