Percolation-amplified infrared sensitivity in titanium oxide-multi-walled carbon nanotube composite films

Abstract

Titanium dioxide (TiO2)-multi-walled carbon nanotube (MWCNT) thin films were prepared and studied systematically for the effects of the concentration of MWCNTs on the electro-optical properties. Result shows that the addition of MWCNTs not only improves the optical absorption and electrical conductivity, but also reduces the 1/f noise of the films. Percolation phenomenon is observed at MWCNT concentrations of 0.20–0.25 wt%. In this concentration range, the composite films exhibit an abrupt rise of the temperature coefficient of resistance value (−2.93% K−1) and large general thermal parameter, both of which are desirable for applications in uncooled infrared detectors.

Carbon nanotube versus graphene in modifying the electrical and optical properties of organic nonlinear optical material

“…4a). This suggests an electrical percolation phenomenon in the DAST-CNT composite films, as previously observed in the TiO 2 -CNT and Na 3 MnCO 3 PO 4 -carbon black composites (Liang et al 2019;Wang et al 2015b). Similarly, R RT of the DAST-G composite films also drastically decrease with the increase of the G concentration, and an electrical percolation phenomenon is seen at 2.0 wt% G in the DAST-G composite films.…”

“…2b). In this case, continuous conductive networks are formed, with which electrons can hop across and/or tunnel through the interfaces between the adjacent CNTs (Liang et al 2019). But if more CNTs are added to DAST, only a slight decrease of R RT with the CNT content is seen (Fig.…”

TiO2−x films for bolometer applications: recent progress and perspectives

“…As a metal oxide semiconductor, titanium dioxide (TiO 2 ) has attracted much attention because of its nontoxic, high chemical stability, high dielectric coefficient, diverse and straightforward preparation methods [16]. TiO 2 is widely used in sensitized solar cells, gas sensors, resistance switch storage, photocatalysis and memristor [17][18][19][20][21].…”

“…TiO 2 is widely used in sensitized solar cells, gas sensors, resistance switch storage, photocatalysis and memristor [17][18][19][20][21]. TiO 2 can be widely used in these fields related to its structure and properties [16]. Non-stoichiometric titanium oxide (TiO 2−x ) means that Ti has different chemical states Ti 3+ and Ti 4+ , corresponding to Ti 2 O 3 and TiO 2 .…”

Carbon Nanotube-Based Uncooled Bolometers: Advances and Progress

“…Following this work, in 2019, Liang et al synthesized another metal-oxide/MWCNT hybrid (Ti dioxide, TiO 2 /MWCNT) and studied its thermal characteristics to obtain a RT-TCR value of ∼2.93%/K (Figure d). In this study, the composite was formed by spraying MWCNTs on top of a sol–gel-synthesized TiO 2 film . At the end of 2019, Nandi et al demonstrated ∼486% enhancement of the RT-TCR of MWCNT by coupling it with VO x .…”