Abstract：
Organic pollutant detection has caused widespread concern regarding due to their potential environmental and human health risks. In this work, a nitrogen-doped titanium dioxide/silver oxide (N-TiO2/Ag2O) composite has been designed as a sensitive photoelectrochemical (PEC) monitoring platform of organic dyes. Sensitive determination relies on the outstanding PEC performance of N-TiO2/Ag2O. The improved PEC performance stems from the effective separation of photocarriers and the extended light response range provided by the narrowing bandgap and a p-n junction with N-TiO2/Ag2O. The N-TiO2/Ag2O electrode exhibits a photocurrent density of up to 2.2 mA/cm2, demonstrating three times increase compared with the photocurrent density observed with the pure TiO2 film. The linear detection range for rhodamine B (RhB), methylene blue (MB), and methyl orange (MO) is 0.2 ng/mL to 10 μg/mL with an ultrasensitive detection limit of 0.2 ng/mL without bias voltage. Due to the outstanding photocurrent density and sensitive response to organic pollutants, the N-TiO2/Ag2O PEC sensor provided a promising analytical method to detect environmental organic dyes.
摘要：
有机污染物检测因其潜在的环境和人类健康风险而引起广泛关注。在这项工作中,一种氮掺杂的二氧化钛/氧化银（N-TiO2/Ag2O）复合材料已被设计为有机染料的灵敏光电化学（PEC）监测平台。灵敏的测定依赖于N-TiO2/Ag2O的出色PEC性能。改善的PEC性能源于光电载流子的有效分离以及由变窄的带隙和具有N-TiO2/Ag2O的p-n结提供的扩展的光响应范围。N-TiO2/Ag2O电极的光电流密度高达2.2mA/cm2，与纯TiO2膜观察到的光电流密度相比，增加了三倍。罗丹明B（RhB）的线性检测范围，亚甲蓝(MB),甲基橙（MO）为0.2ng/mL至10μg/mL，在无偏置电压下的超灵敏检测限为0.2ng/mL。由于优异的光电流密度和对有机污染物的敏感响应，N-TiO2/Ag2OPEC传感器为检测环境有机染料提供了一种有前途的分析方法。
