Nano Science & Nano Technology: An Indian Journal

Open Access Open Access  Restricted Access Subscription Access

Relative Humidity Monitoring of Ag-Doped TiO2


Affiliations
1 Department of Physics, Faculty of Engineering & Technology, University of Lucknow, Lucknow, U.P., India., India
2 Department of Physics, University of Lucknow, Lucknow, U.P., India., India
 

Practical applications of TiO2 are limited due to its wide band gap and fast recombination of electron-hole pairs within nanoseconds. So far numerous researches have been focused on defeating these disadvantages by introducing noble metals into titania lattice. Noble metals deposited or doped in TiO2 have high Schottky barriers among the metals and act as electron traps, facilitating electron-hole separation and promoting the interfacial electron transfer process. These additives capture electrons resulting in a lower recombination rate of electron-hole pairs. However, some noble metals such as Pt, Pd, Rh, and Au are too expensive to be used on the industrial scale. Therefore, the research on Ag-doped TiO2 has significant practical value. Silver is suitable for industrial applications due to its comparable cost and easy preparation. It is a suitable element, which improves the TiO2 photo-catalytic performance, it is also believed that the silver ions interact with sulfur, oxygen, and nitrogen in the molecules of microorganisms and inactivate the cellular proteins resulting in titania as better bioactive material. Ag-doped titania layers with different morphologies have been grown by the Sol-gel method.

Keywords

Bioactive material, Electron-hole recombination, Humidity sensors, Photo-catalytic performance.
User
Notifications
Font Size

  • Kulwicki BM. Humidity sensors. J Am Ceram Soc. 1991; 74(4):697-708.

  • Mistry KK, Saha D, Sengupta K. Sol–gel processed Al2O3 thick film template as sensitive capacitive trace moisture sensor. Sens Actuators B: Chem. 2005; 106(1): 258-62.

  • Kummer AM, Hierlemann A. Configurable electrodes for capacitive-type sensors and chemical sensors. IEEE Sens J. 2006; 6(1):3-10.

  • Bayhan M, Hashemi T, Brinkman AW. Sintering and humidity-sensitive behaviour of the ZnCr2O4–K22CrO4 ceramic system. Journal of Materials Science. 1997; 32:6619-23.

  • Traversa E. Ceramic sensors for humidity detection: the state-of-the-art and future developments. Sens Actuators B Chem. 1995;23(2-3):135-56.

  • Yeh YC, Tseng TY, Chang DA. Electrical properties of TiO2‐K2Ti6O13 porous ceramic humidity sensor. J Am Ceram. Soc. 1990;73(7):1992-8.

  • Wu L, Wu CC, Wu MM. Humidity sensitivity of Sr (Sn, Ti) O3 ceramics. Journal of electronic materials. 1990;19:197-200.

  • Nitta T, Terada Z, Hayakawa S. Humidity‐Sensitive Electrical Conduction of MgCr2O4‐TiO2 Porous Ceramics. J Am Ceram. Soc. 1980; 63(5‐6):295-300.

  • Chachulski B, Gebicki J, Jasinski G, et al. Properties of a polyethyleneimine-based sensor for measuring medium and high relative humidity. Meas Sci Technol. 2005; 17(1):12.

  • Yadav BC, Pandey NK, Srivastava AK, et al. Optical humidity sensors based on titania films fabricated by sol–gel and thermal evaporation methods. Meas Sci Technol. 2006; 18(1):260.

  • Pandey NK, Tripathi A, Tiwari K, et al. Morphological and humidity sensing studies of WO3 mixed with ZnO and TiO2 powders. Sensors and Transducers. 2008; 96(9):42-6.

  • Parvatikar N, Jain S, Khasim S, et al. Electrical and humidity sensing properties of polyaniline/WO3 composites. Sens Actuators B Chem. 2006; 114(2):599-603.


Abstract Views: 134

PDF Views: 0




  • Relative Humidity Monitoring of Ag-Doped TiO2

Abstract Views: 134  |  PDF Views: 0

Authors

Anupam Kumar Tripathi
Department of Physics, Faculty of Engineering & Technology, University of Lucknow, Lucknow, U.P., India., India
Anoop Kumar
Department of Physics, University of Lucknow, Lucknow, U.P., India., India

Abstract


Practical applications of TiO2 are limited due to its wide band gap and fast recombination of electron-hole pairs within nanoseconds. So far numerous researches have been focused on defeating these disadvantages by introducing noble metals into titania lattice. Noble metals deposited or doped in TiO2 have high Schottky barriers among the metals and act as electron traps, facilitating electron-hole separation and promoting the interfacial electron transfer process. These additives capture electrons resulting in a lower recombination rate of electron-hole pairs. However, some noble metals such as Pt, Pd, Rh, and Au are too expensive to be used on the industrial scale. Therefore, the research on Ag-doped TiO2 has significant practical value. Silver is suitable for industrial applications due to its comparable cost and easy preparation. It is a suitable element, which improves the TiO2 photo-catalytic performance, it is also believed that the silver ions interact with sulfur, oxygen, and nitrogen in the molecules of microorganisms and inactivate the cellular proteins resulting in titania as better bioactive material. Ag-doped titania layers with different morphologies have been grown by the Sol-gel method.

Keywords


Bioactive material, Electron-hole recombination, Humidity sensors, Photo-catalytic performance.

References