PDF(Pubmed)
Abstract：
Zinc oxide (ZnO) is considered to be one of the most explored and reliable sensing materials for UV detection due to its excellent properties, like a wide band gap and high exciton energy. Our current study on a photodetector based on tetrapodal ZnO (t-ZnO) reported an extremely high UV response of ~9200 for 394 nm UV illumination at 25 °C. The t-ZnO network structure and morphology were investigated using XRD and SEM. The sensor showed a UV/visible ratio of ~12 at 25 °C for 394 nm UV illumination and 443 nm visible illumination. By increasing the temperature, monotonic decreases in response and recovery time were observed. By increasing the bias voltage, the response time was found to decrease while the recovery time was increased. The maximum responsivity shifted to higher wavelengths from 394 nm to 400 nm by increasing the operating temperature from 25 °C to 100 °C. The t-ZnO networks exhibited gas-sensing performances at temperatures above 250 °C, and a maximum response of ~1.35 was recorded at 350 °C with a good repeatability and fast recovery in 16 s for 100 ppm of n-butanol vapor. This study demonstrated that t-ZnO networks are good biosensors that can be used for diverse biomedical applications like the sensing of VOCs (volatile organic compounds) and ultraviolet detection under a wide range of temperatures, and may find new possibilities in biosensing applications.
摘要：
氧化锌(ZnO)因其优异的性能,被认为是目前最先进、最可靠的紫外检测传感材料之一。像宽带隙和高激子能量。我们目前对基于四足ZnO（t-ZnO）的光电探测器的研究报道了在25°C下对394nmUV照明的极高UV响应约9200。利用XRD和SEM研究了t-ZnO网络结构和形貌。对于394nm的UV照射和443nm的可见光照射,传感器在25°C下显示〜12的UV/可见光比。通过增加温度，观察到响应和恢复时间的单调减少。通过增加偏置电压，发现响应时间减少，而恢复时间增加。通过将工作温度从25°C增加到100°C，最大响应度从394nm转移到更高的波长到400nm。t-ZnO网络在高于250°C的温度下表现出气敏性能，对于100ppm的正丁醇蒸气，在350°C下记录到〜1.35的最大响应，具有良好的可重复性和在16s内的快速恢复。这项研究表明，t-ZnO网络是良好的生物传感器，可用于多种生物医学应用，如挥发性有机化合物（VOCs）的传感和在宽范围的温度下的紫外线检测。并可能在生物传感应用中找到新的可能性。
