Compositional engineering of VOPcPhO-TiO2 nano-composite to reduce the absolute threshold value of humidity sensors

作者：Azmer Mohamad Izzat; Aziz Fakhra; Ahmad Zubair^*; Raza Ehsan; Najeeb Mansoor Ani; Fatima Noshin; Bawazeer Tahani M; Alsoufi Mohammad S; Shakoor R A; Sulaiman Khaulah

来源：Talanta, 2017, 174: 279-284.

DOI：10.1016/j.talanta.2017.06.016

• Absolute threshold
• VOPcPhO:TiO2
• Nano-composite
• Compositional engineering
• Relative humidity

This research work demonstrates compositional engineering of an organic-inorganic hybrid.nano-composites for modifying absolute threshold of humidity sensors. Vanadyl-2,9,16,23-tetraphenoxy-29H,31H-phthalocyanine (VOPcPhO), an organic semiconductor, doped with Titanium-dioxide nanoparticles (TiO2 NPs) has been employed to fabricate humidity sensors. The morphology of the VOPcPhO:TiO2 nano-composite films has been analyzed by atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). The sensors have been examined over a wide range of relative humidity i.e. 20-99% RH. The sensor with TiO2 (90 nm) shows reduced sensitivity-threshold and improved linearity. The VOPcPhO:TiO2 (90 nm) nano composite film is comprised of uniformly distributed voids which makes the surface more favorable for adsorption of moisture content from environment. The VOPcPhO:TiO2 nano-composite based sensor demonstrates remarkable improvement in the sensing parameter when equated with VOPcPhO sensors.

• 出版日期2017-11-1