Platinum nanoparticle modified TiO2 nanorods with enhanced catalytic performances

An, Bao-Li; Fu, Yan-He; Dai, Fan-Zeng; Xu, Jiaqiang

doi:10.1016/j.jallcom.2014.10.082

Cited by 12 publications

(3 citation statements)

References 33 publications

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“…Therefore, the photogenerated electrons run swiftly to reach the interface between TiO 2 and Pt before recombinations of the electron-hole pairs. The Pt NPs hold the electrons like electron traps by utilizing the Schottky barriers [ 21 , 40 ]. Finally, it leads to the fast sensing response, as demonstrated in Figure 6 , by letting the electrons react with the NO 2 gas at the surface.…”

Section: Resultsmentioning

confidence: 99%

“…Another possible improvement is further performance enhancement made by loading noble metal nanoparticles (NPs) on photoactivated metal oxide semiconductors. Titanium dioxide (TiO 2 ) decorated with the noble metal NPs, such as Pt [ 21 , 22 ], Au [ 23 , 24 ], Pd [ 25 , 26 ], or Ag [ 27 , 28 ], is a widely known example. The charge separation, by which the photocatalytic activity is remarkably improved, is one of the expected effects, although the exact mechanism has not been disclosed clearly [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, to extend the time for the separation between the electron-hole pair, the noble metal NPs have been utilized. The noble metal NPs on TiO 2 work as electron traps by forming the high Schottky barriers at the interface, thereby significantly improving the performance [ 21 , 22 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

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TiO2 Nanorods and Pt Nanoparticles under a UV-LED for an NO2 Gas Sensor at Room Temperature

Noh

Kwon

Park

et al. 2021

Sensors

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Because the oxides of nitrogen (NOx) cause detrimental effects on not only the environment but humans, developing a high-performance NO2 gas sensor is a crucial issue for real-time monitoring. To this end, metal oxide semiconductors have been employed for sensor materials. Because in general, semiconductor-type gas sensors require a high working temperature, photoactivation has emerged as an alternative method for realizing the sensor working at room temperature. In this regard, titanium dioxide (TiO2) is a promising material for its photocatalytic ability with ultraviolet (UV) photonic energy. However, TiO2-based sensors inevitably encounter a problem of recombination of photogenerated electron-hole pairs, which occurs in a short time. To address this challenge, in this study, TiO2 nanorods (NRs) and Pt nanoparticles (NPs) under a UV-LED were used as an NO2 gas sensor to utilize the Schottky barrier formed at the TiO2-Pt junction, thereby capturing the photoactivated electrons by Pt NPs. The separation between the electron-hole pairs might be further enhanced by plasmonic effects. In addition, it is reported that annealing TiO2 NRs can achieve noteworthy improvements in sensing performance. Elucidation of the performance enhancement is suggested with the investigation of the X-ray diffraction patterns, which implies that the crystallinity was improved by the annealing process.

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Section: Resultsmentioning

confidence: 99%