Plasmonic-enhanced electrochemical detection of volatile biomarkers with gold functionalized TiO2 nanotube arrays

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2018,（6）
• 页码范围: 905-913
• 页数: 9页
• 语种: 英文

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 volatileorganic 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.