Nanohole Array-Based Diverse Sensing System Towards Next Generation Technology Open Access
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The present work demonstrates the development of a miniaturized plasmonic platform based on Au nanohole arrays (NHAs). In this work, a sensing platform has been investigated including operation principles, numerical simulation, device fabrication, sensor functionalization, performance testing, and signal processing. The Au plasmonic platform was coated with a Cu-benzenetricarboxylate (Cu-BTC) metal organic framework (MOF) to form a gas-phase sensor to detect concentrations approaching nmol/mol (ppb) levels of volatile organic compounds (VOCs), such as acetone or ethanol vapors, at room temperature. The sensing characteristics of the composite system were further investigated by varying the operating temperature (296 K to 318 K) of the sensor and the concentrations of vapors (500 nmol/mol to 10 μmol/mol). The plasmonic responses for the sensors were correlated with the adsorption of vapors in the MOF film and modeled in accordance with Langmuir-type adsorption. Kinetic parameters were estimated for the adsorption of fixed concentrations of acetone and ethanol vapors within the studied operating temperature range to discriminate different vapors. On the other hand, the sensing platform can also be used as a liquid-phase bio-sensor to detect biomarkers such as forms of DNA. In this work, a new method was also developed that can monitor the sensors using a commercial camera. By this method, multiple sensors can be measured at the same time. The measured data can be processed with machine learning technology to identify and quantify the sensing analytes.