Light-activated gas sensing: a perspective of integration with micro-LEDs and plasmonic nanoparticles

Abstract

Light-activated gas sensors have been investigated for their superior potential to replace current thermally activated gas sensors. This review summarizes the various efforts made for their development and provides an overview of the progress.

Electrospun Metal Oxide Nanofibers and Their Conductometric Gas Sensor Application. Part 2: Gas Sensors and Their Advantages and Limitations

“…In addition, the operating temperature was reduced from about 290 to 170 • C. The optimization effect of UV irradiation was also observed in the detection of formaldehyde by SnO 2 /TiO 2 [329] and SnO 2 /ZnO heterostructure-based sensors [330]. The mechanism of the UV irradiation influence on sensor characteristics is described in sufficient detail in [187,[331][332][333][334][335][336]. In [52,187,337,338], it was suggested that the absorbed photons modulate the receptor function of the MOX by (1) excitation of the solid (in other words, enhancement of the concentration of charge carriers in the solid), (2) the formation of highly reactive surface radicals, (3) a change in both the surface density of adsorption sites of various types and the surface coverage by the gas-adsorbed species and (4) the filling of defects with charge carriers.…”

Tailoring the molecular weight of polymer additives for organic semiconductors

“…On the other hand, PEO is a semicrystalline polymer exhibiting unique crystallization behavior in stark contrast to the conjugated and amorphous counterparts. PEO can eliminate the potential impact from conjugated polymer induced π-π interactions and cocrystallization on the target organic semiconductor [38], which is not a feasible process to optimize for simplified device fabrication procedures. With that said, PEO retains an amorphous nature which helps improve the semiconductor diffusivity and surface energies.…”

“…29,30 The enhanced π–π stacking in TIPS pentacene is attributed to higher charge transport. 31 These research endeavors have opened up vast opportunities for organic semiconductors to be applied in high performance organic electronic devices such as organic thin film transistors, 32–35 organic gas sensors, 36–38 photovoltaic devices 39–41 and logic circuits. 42–44 In this section, we will review the important studies that investigated the solution processability and charge carrier mobility of organic semiconductor based thin film transistors, as well as their application in fabricating organic gas sensors.…”

Rationally Designed TiO2 Nanostructures of Continuous Pore Network for Fast‐Responding and Highly Sensitive Acetone Sensor

“…[ 19 ] Moreover, their nontoxicity, low cost, and high environmental stability can be other advantages of TiO 2 for gas sensor application. [ 18 ] Although 2D materials, [ 20–23 ] organic–inorganic hybrid perovskites, [ 24,25 ] or light‐activated materials [ 26–28 ] have been suggested for the active sensor materials for energy‐efficient gas sensing, their selectivity has been limited only to highly reactive gases unless other additives are incorporated. To further enhance the gas sensing properties of MOS, noble metal catalysts decoration [ 29–31 ] or heterojunction engineerings [ 16,17,33 ] have been suggested.…”