Photocatalytic properties of titania thin films prepared by sputtering versus evaporation and aging of induced oxygen vacancy defects

Engineering oxygen vacancy on rutile TiO2 for efficient electron-hole separation and high solar-driven photocatalytic hydrogen evolution

“…Because the rutile TiO 2 is extremely stable thermodynamically and has less surface defects than the anatase TiO 2 , constructing rutile TiO 2 with surface defects is promising to have enhanced photocatalytic activity. Surface oxygen vacancy (V O ), as one of the most important surface defects of TiO 2 , receives extensive attention [31][32][33][34][35]. Too low or high content of V O defects are not conducive to narrowing the bandgap and improving the separation efficiency of photogenerated electron-hole pairs.…”

Tantalum oxide thin films for electrochemical pH sensor

“…These materials in their thin film form are found to be stable at high temperature. Reports reveal that these materials are also found to be prominent pH sensing material due to their high electronic conductivity as a result of defects produced such as high oxygen deficiency [9][10][11][12][13][14][15]. Metal oxides can be deposited on suitable substrates like glass, silicon etc using several techniques such as physical and chemical vapor deposition techniques [2,[10][11][12][13][14][15][16].…”

“…Among the metal oxides, Ta 2 O 5, a transition metal oxide, exhibits thermal and chemical stability and excellent electrochemical reversibility [13,14]. Ta 2 O 5 is found to be more significant for the fabrication of ion sensitive field effect transistors (ISFETs) due to its low drift and high sensitivity [14].…”

“…Among the metal oxides, Ta 2 O 5, a transition metal oxide, exhibits thermal and chemical stability and excellent electrochemical reversibility [13,14]. Ta 2 O 5 is found to be more significant for the fabrication of ion sensitive field effect transistors (ISFETs) due to its low drift and high sensitivity [14]. The utilization of this material is reported as pH sensing electrode by several researchers using voltammetry and capacitance-voltage (CV) technique [17][18][19][20].…”

Synthesis of Surface Oxygen-deficient BiPO4 Nanocubes with Enhanced Visible Light Induced Photocatalytic Activity

“…However, the charge separation in this p-n heterojunctions always undergoes the photogenerated electrons transferring to the CB of BiPO 4 leaving holes on the VB of narrow band semiconductors [12][13][14] , which can hardly use the high oxidation ability of holes in the higher VB of BiPO 4 . Recently, the oxygen defects have been reported can greatly enhance the photocatalytic activity and expand the range of photoresponse in the semiconductor photocatalysts [15][16][17][18] . As investigated, the oxygen vacancies can not only serve as photoinduced charge traps to prevent the electron−hole recombination, they are also effective adsorption sites to adsorb active species which may greatly increase the photocatalytic activity 17,18 .…”