Ultrasensitive photoelectrochemical sensing of nicotinamide adenine dinucleotide based on graphene-TiO2 nanohybrids under visible irradiation

作者：Wang Kun; Wu Jun; Liu Qian; Jin Yicong; Yan Jiajia; Cai Jianrong

来源：Analytica Chimica Acta, 2012, 745: 131-136.

DOI：10.1016/j.aca.2012.07.042

• Photoelectrochemical sensor
• Graphene-TiO2 nanohybrids
• NADH determination

In this paper, the photoelectrochemical behavior of graphene-TiO2 (G-TiO2) nanohybrids was investigated in the visible region and a new photoelectrochemical sensor for sensitive determination of nicotinamide adenine dinucleotide (NADH) was proposed. Under visible light, the G-TiO2 nanohybrids possessed enhanced photocurrent, which was nearly 5 times than that of pure TiO2 nanocrystals (NCs). Based on the enhanced photocurrent of G-TiO2 nanohybrids toward NADH, a new photoelectrochemical methodology for ultrasensitive determination of NADH was developed. The proposed sensor showed linearly enhanced photocurrent by increasing the NADH concentration from 1.0 x 10(-8) to 2.0 x 10(-3) M with a low detection limit of 3.0 x 10(-9) M. Furthermore, this sensor exhibited good selectivity and stability towards NADH determination. This strategy opens up a new avenue for the application of graphene-based hybrids in the field of photoelectrochemical sensing and monitoring.

• 出版日期2012-10-1
• 单位江苏大学