Enhancement of Interfacial Charge Transfer of TiO₂/Graphene with Doped Ca²⁺ for Improving Electrical Conductivity

Abstract

Imparting surface coatings with conductivity is an effective way to prevent fire and explosion caused by electrostatic discharge. TiO 2 is a commonly used paint; however, intrinsic TiO 2 has poor electrical conductivity. Herein, we develop a method to make TiO 2 coating highly conductive by doping Ca 2+ into the TiO 2 lattice based on the introduction of graphene. It is demonstrated that doping Ca 2+ increases the carrier density of TiO 2 and its morphology changes from a sphere to a spindle shape, which increases the interfacial contact area between TiO 2 and graphene. Therefore, resistivity can be greatly decreased due to the construction of fast charge transport pathways from TiO 2 to graphene, resulting from an increase in the speed of interfacial charge transfer. In addition, the electronic properties of the samples are also studied through first-principles calculations before and after Ca 2+ doping. The result of the theoretical analysis is in agreement with that of experiments. Thus, the lowest resistivity of Ca 2+ -TiO 2 /graphene can reach 0.004 Ω cm. Consequently, the feature of superior conductivity of the Ca 2+ -TiO 2 /graphene composite endows it with practical application potential in the field of antistatic coating.

A Series of POM–Viologen Photo-/Electrochromic Hybrids and Hydrogels Acting as Multifunctional Sensors for Detecting UV, Hg2+, and Organic Amines

“…1 – 3 showed the same UV trend (Figures S39–S41). The absorption peaks in both the visible and ultraviolet regions increased after metal ion detection, indicating that the compounds established a new charge transfer process for metal ions. , In order to highlight the good color-changing performance of 1 – 3 , blank experiments were carried out. The blank test paper without compound and test paper containing only ligand were immersed in three metal ion solutions, removed, and exposed to light, and there was no color change (Figure S42, Figure S43).…”

Interfacial Engineering of Ti3C2Tx MXene Electrode Using g-C3N4 Nanosheets for High-Performance Supercapacitor in Neutral Electrolyte

“…The electrical conductivity of the freestanding films was obtained using a 4-point probe measurement (see Table ). Introducing pg-C 3 N 4 was found to improve the electrical conductivity, which was plausibly due to the generation of conjugated network between pg-C 3 N 4 nanosheets and Ti 3 C 2 T x . , In the case of MCN10, the large increase in electrical conductivity could be attributed to the lowing in d -spacing, resulting in shortened conductive pathway. , …”

Construction of Five POM Compounds by Tuning Spacer Length and Piperazine/Morpholine Groups: Electrochemical Sensing Properties and Application on Capacitor Materials

“…To evaluate the cycling stabilities, which is one of the crucial factors to assess the performance of the electrochemical capacitor, the performance of 1000 charge/discharge cycles of electrode materials was conducted . The cycling stabilities of compounds 1 – 5 are shown in Figure .…”