Dynamics of Interfacial Charge Transfer Emission in Small Molecule Sensitized TiO2 Nanoparticles: Is It Localized or Delocalized?

2010 ◽  
Vol 114 (32) ◽  
pp. 13917-13925 ◽  
Author(s):  
Shankar Varaganti ◽  
Guda Ramakrishna
Keyword(s):  
Charge Transfer ◽  
Tio2 Nanoparticles ◽  
Small Molecule ◽  
Interfacial Charge Transfer ◽  
Interfacial Charge

Interfacial charge transfer dynamics in small molecule-modified TiO 2 nanoparticles

2010 ◽  
Author(s):  
Shankar Varaganti ◽  
Edwin Mghangha ◽  
Jameel A. Hasan ◽  
Guda Ramakrishna
Keyword(s):  
Charge Transfer ◽  
Small Molecule ◽  
Interfacial Charge Transfer ◽  
Charge Transfer Dynamics ◽  
Interfacial Charge

scholarly journals Improving Interfacial Charge-Transfer Transitions in Nb-Doped TiO2 Electrodes with 7,7,8,8-Tetracyanoquinodimethane

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 367 ◽  
Author(s):  
Reo Eguchi ◽  
Yuya Takekuma ◽  
Tsuyoshi Ochiai ◽  
Morio Nagata
Keyword(s):  
Charge Transfer ◽  
Electron Transport ◽  
Tio2 Nanoparticles ◽  
Conduction Band ◽  
Charge Separation ◽  
Electron Injection ◽  
Tio2 Electrode ◽  
Interfacial Charge Transfer ◽  
Doped Tio2 ◽  
Interfacial Charge

Interfacial charge-transfer (ICT) transitions involved in charge-separation mechanisms are expected to enable efficient photovoltaic conversions through one-step charge-separation processes. With this in mind, the charge-transfer complex fabricated from TiO2 nanoparticles and 7,7,8,8-tetracyanoquinodimethane (TCNQ) has been applied to dye-sensitized solar cells. However, rapid carrier recombination from the conduction band of TiO2 to the highest occupied molecular orbital (HOMO) of TCNQ remains a major issue for this complex. In this study, to inhibit surface-complex recombinations, we prepared Nb-doped TiO2 nanoparticles with different atomic ratios for enhanced electron transport. To investigate the effects of doping on electron injection through ICT transitions, these materials were examined as photoelectrodes. When TiO2 was doped with 1.5 mol % Nb, the Fermi level of the TiO2 electrode shifted toward the conduction band minimum, which improved electron back-contact toward the HOMO of TCNQ. The enhancement in electron transport led to increases in both short circuit current and open circuit voltage, resulting in a slight (1.1% to 1.3%) improvement in photovoltaic conversion efficiency compared to undoped TiO2. Such control of electron transport within the photoelectrode is attributed to improvements in electron injection through ICT transitions.

Improved photocatalytic activity of RGO/MoS2 nanosheets decorated on TiO2 nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (38) ◽  
pp. 31661-31667 ◽  
Author(s):  
Dipak Bapurao Nimbalkar ◽  
Hsin-Hsi Lo ◽  
P. V. R. K. Ramacharyulu ◽  
Shyue-Chu Ke
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Tio2 Nanoparticles ◽  
Recombination Rate ◽  
Active Sites ◽  
Mos2 Nanosheets ◽  
Electron Hole ◽  
Interfacial Charge Transfer ◽  
Surface Active ◽  
Interfacial Charge

Interfacial charge transfer from TiO2 nanoparticles to layered MoS2 surface active sites via RGO nanosheets by suppressing the recombination rate of electron–hole pairs for enhanced photocatalytic activity.

Sign in / Sign up

Export Citation Format

Share Document