Plasmonic-enhanced electrochemical detection of volatile biomarkers with gold functionalized TiO2 nanotube arrays
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第6期
论文作者：Dhiman Bhattacharyya Pankaj Kumar York R.Smith Swomitra K.Mohanty Mano Misra
文章页码：905 - 913
摘 要：Titania nanotubular arrays（TNA） synthesized via electrochemical anodization is a stable and versatile material, widely studied for photocatalytic and sensing applications, whereas nano-sized gold particles are a known plasmonic material. Semiconductor–metal nanocomposites in isolated, embedded, or encapsulated form, when irradiated with proper light frequency can exhibit localized surface plasmon resonance（LSPR） effect. This effect can result in improved light adsorption and electrical properties of a material. In this study, we report the enhanced visible light photo-response of LSPR induced volatile organic biomarker vapor sensing at room temperature using a Au-embedded TNA electrochemical sensor.Two mechanisms are proposed. One based on classical physics（band theory）, which explains operation under non-irradiated conditions. The second mechanism is based on the coupling of classical and quantum physics（molecular orbitals）, and explains sensor operation under irradiated conditions.
Dhiman Bhattacharyya1，Pankaj Kumar1，York R.Smith1，Swomitra K.Mohanty1,2，Mano Misra1,2
1. Department of Metallurgical Engineering, University of Utah2. Department of Chemical Engineering, University of Utah
摘 要：Titania nanotubular arrays（TNA） synthesized via electrochemical anodization is a stable and versatile material, widely studied for photocatalytic and sensing applications, whereas nano-sized gold particles are a known plasmonic material. Semiconductor–metal nanocomposites in isolated, embedded, or encapsulated form, when irradiated with proper light frequency can exhibit localized surface plasmon resonance（LSPR） effect. This effect can result in improved light adsorption and electrical properties of a material. In this study, we report the enhanced visible light photo-response of LSPR induced volatile organic biomarker vapor sensing at room temperature using a Au-embedded TNA electrochemical sensor.Two mechanisms are proposed. One based on classical physics（band theory）, which explains operation under non-irradiated conditions. The second mechanism is based on the coupling of classical and quantum physics（molecular orbitals）, and explains sensor operation under irradiated conditions.
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