The Response of UV/Blue Light and Ozone Sensing Using Ag-TiO2 Planar Nanocomposite Thin Film

Abstract

We successfully fabricated a planar nanocomposite film that uses a composite of silver nanoparticles and titanium dioxide film (Ag-TiO2) for ultraviolet (UV) and blue light detection and application in ozone gas sensor. Ultraviolet-visible spectra revealed that silver nanoparticles have a strong surface plasmon resonance (SPR) effect. A strong redshift of the plasmonic peak when the silver nanoparticles covered the TiO2 thin film was observed. The value of conductivity change for the Ag-TiO2 composite is 4–8 times greater than that of TiO2 film under UV and blue light irradiation. The Ag-TiO2 nanocomposite film successfully sensed 100 ppb ozone. The gas response of the composite film increased by roughly six and four times under UV and blue light irradiation, respectively. We demonstrated that a Ag-TiO2 composite gas sensor can be used with visible light (blue). The planar composite significantly enhances photo catalysis. The composite films have practical application potential for wearable devices.

Ultrahigh SERS activity of the TiO2@Ag nanostructure leveraged for accurately detecting CTCs in peripheral blood

“…36 Hence, the absorption peak at ∼400 nm is mainly attributed to the SPR effect of Ag NPs, 37,38 and the spectrum of TiO 2 @Ag displays a blueshift when loaded with Ag NPs. 39,40…”

“…36 Hence, the absorption peak at ∼400 nm is mainly attributed to the SPR effect of Ag NPs, 37,38 and the spectrum of TiO 2 @Ag displays a blueshift when loaded with Ag NPs. 39,40 3.2. Preparation of TiO 2 @Ag-R6G-rBSA-FA SERS measurements of the TiO 2 @Ag nanostructure were carried out with various concentrations of R6G molecules.…”

Recent Developments in Ozone Sensor Technology for Medical Applications

“…As substrate, silicon dioxide/silicon, aluminium oxide, glass, aluminium, and quartz and for electrodes platinum, gold, titanium, and copper are commonly employed. The electrode thickness ranges between 100 [26,43,45,46,51,66,67] and 300 nm [61], while the distance between two opposing electrodes varies between 5 µm [64] and 50 mm [43,51,60]. The measurement temperature is between 0 and 350 • C. Some of the sensors utilise a light activation of the sensor surface that allows significant reduction of the response time at low measurement temperatures, which can be derived from Table 3.…”

Aluminium-Based Plasmonic Sensors in Ultraviolet

“…This, as a consequence, influences the UV-SPPs sensing performance. The integration of a passive oxidation layer into the device design not only allows for its operation in normal atmospheric conditions but may also be used for the detection of oxidizing agents, such as ozone [14]. Due to the fact that the thicknesses of both the Al film and Al 2 O 3 layers affect the sensor performance, it is crucial to optimize the geometry of the sensor.…”