✍ Scribed by Hong-Tao Sun; Zhi-Tao Cheng; Xi Yao; Wojciech Wlodarski
No coin nor oath required. For personal study only.
Porous silica coatings on AT-cut quartz crystals are derived from the sol-gel process. Hydrochloric acid catalyst is used to accelerate hydrolysis and polymerization of a silica solution. Experimental results show that the noncrystalline silica material has a lot of nanometer pores. The resonant frequency of the coated quartz resonantors decreases with increasing relative humidity. The maximum frequency shit of 3.72 kHz due to humidity is achieved.
The response and long-term stability of the humidity sensor are investigated.
📜 SIMILAR VOLUMES
## Abstract A fiber sensor based on an etched superstructure fiber Bragg grating coated with the thin film of sol–gel is used for measuring the relative humidity. The operation mechanism of this sensor is based on that sol–gel materials can react with H~2~O molecules to result in its reflective ind
The sol-gel dipping process, in which liquid silicon alkoxide is transformed into a solid silicon-oxygen network, can produce a thin film coating of silica (SiO 2 ). The features of this method are high homogeneity and purity of the thin SiO 2 film and a low sinter temperature, which are important i