1. A label-free cytochrome c photoelectrochemical aptasensor based on CdS/CuInS2/Au/TiO2 nanotubes
- Author
-
Bing Zhang, Pengtao Sheng, Lijia Wang, Wenhong Gu, Qingyun Cai, and Zhiwei Zhang
- Subjects
Photocurrent ,Materials science ,biology ,Cytochrome c ,Metals and Alloys ,Ionic bonding ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Electron transfer ,Adsorption ,Quantum dot ,Electrode ,Materials Chemistry ,biology.protein ,Electrical and Electronic Engineering ,0210 nano-technology ,Instrumentation - Abstract
CdS/CuInS2/Au/TiO2 nanotube arrays (NTAs) were fabricated by deposition and dipping technique as well as successive ionic layer adsorption and reaction method, where Au nanoparticles were used to improve the interfacial electron transfer and quantum dots (QDs) of CdS and CuInS2 (4.1 nm) to stimulate the formation of an ideal stepwise band edge structure with TiO2. High and stable photocurrent responses were observed on the NTA electrode. A photoelectrochemical aptasensor toward cytochrome c (cyt c) was then fabricated by immobilization of HS-aptamer on the NTAs via Cd-S bond and Cu-S bond. Sensitive and selective detection of cyt c was achieved with a detection range of 5 pM to 100 nM.
- Published
- 2019