Thin Film Laboratory, Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar-Pradesh, 273009, India.
Environ Sci Pollut Res Int. 2021 Jan;28(4):3920-3927. doi: 10.1007/s11356-020-10211-6. Epub 2020 Jul 23.
In the present study, we fabricate undoped and 1 wt% palladium (Pd)-doped tin oxide (SnO) films were deposited on alumina substrate using screen printing technology. The deposited sensing film is characterized and its microstructural properties are studied using X-ray diffraction (XRD) and atomic force microscope (AFM). The crystallite size, grain size, and roughness parameter decrease with Pd doping. It was ~ 23.5 nm and ~ 19.2 nm for undoped and Pd-doped SnO film samples. The response of fabricated thick film sensor for 1 wt% Pd-doped SnO is maximum (~ 71) with varying concentrations of ethanol (5000 ppm) at operating temperature 473 K. The response/recovery time is observed and it is ~ 41 s/125 s. The reduction in crystallinity and roughness leads to improves sensing behavior towards ethanol gas. The sensing mechanism and response behavior is explained based on a theoretical model.
在本研究中，我们使用丝网印刷技术在氧化铝衬底上制备了未掺杂和 1wt%钯（Pd）掺杂的氧化锡（SnO）薄膜。通过 X 射线衍射（XRD）和原子力显微镜（AFM）对沉积的传感薄膜进行了表征，并研究了其微观结构特性。随着 Pd 的掺杂，晶粒尺寸、晶粒尺寸和粗糙度参数减小。未掺杂和 Pd 掺杂 SnO 薄膜样品的晶粒尺寸分别约为 23.5nm 和 19.2nm。在工作温度为 473K 时，对于 1wt%Pd 掺杂 SnO 制成的厚膜传感器，在不同浓度的乙醇（5000ppm）下，其响应最大（约 71）。响应/恢复时间约为 41s/125s。结晶度和粗糙度的降低导致对乙醇气体的传感性能得到改善。基于理论模型解释了传感机制和响应行为。
