Boscarino Stefano, Filice Simona, Sciuto Antonella, Libertino Sebania, Scuderi Mario, Galati Clelia, Scalese Silvia
CNR-IMM, Ottava Strada n.5, I-95121 Catania, Italy.
STMicroelectronics, Stradale Primosole n. 5, I-95121 Catania, Italy.
Nanomaterials (Basel). 2019 Jul 31;9(8):1099. doi: 10.3390/nano9081099.
Multi-walled carbon nanotubes (CNTs) decorated with zinc oxide nanoparticles (ZnO NPs) were prepared in isopropanol solution by a simple, room-temperature process and characterized from structural, morphological, electronic, and optical points of view. A strong interaction between ZnO and CNTs is fully confirmed by all the characterization techniques. ZnO-CNTs nanocomposites, with different weight ratios, were deposited as a dense layer between two electrodes, in order to investigate the electrical behaviour. In particular, the electrical response of the nanocomposite layers to UV light irradiation was recorded for a fixed voltage: As the device is exposed to the UV lamp, a sharp current drop takes place and then an increase is observed as the irradiation is stopped. The effect can be explained by adsorption and desorption phenomena taking place on the ZnO nanoparticle surface under irradiation and by charge transfer between ZnO and CNTs, thanks to the strong interaction between the two nanomaterials. The nanocomposite material shows good sensitivity and fast response to UV irradiation. Room temperature and low-cost processes used for the device preparation combined with room temperature and low voltage operational conditions make this methodology very promising for large scale UV detectors applications.
通过简单的室温工艺在异丙醇溶液中制备了用氧化锌纳米颗粒（ZnO NPs）修饰的多壁碳纳米管（CNTs），并从结构、形态、电子和光学角度对其进行了表征。所有表征技术都充分证实了ZnO与CNTs之间的强相互作用。为了研究电行为，将不同重量比的ZnO-CNTs纳米复合材料作为致密层沉积在两个电极之间。特别是，在固定电压下记录了纳米复合材料层对紫外光照射的电响应：当器件暴露于紫外灯下时，电流会急剧下降，然后在停止照射时观察到电流增加。这种效应可以通过照射下ZnO纳米颗粒表面发生的吸附和解吸现象以及由于两种纳米材料之间的强相互作用而导致的ZnO与CNTs之间的电荷转移来解释。该纳米复合材料对紫外光照射表现出良好的灵敏度和快速响应。用于器件制备的室温及低成本工艺与室温及低电压操作条件相结合，使得这种方法在大规模紫外探测器应用中非常有前景。
