Effect of annealing temperature on the photocatalytic activity of CdS-modified TNAs/glass nanotube arrays

Pan, Ziwei; Li, Yan; Hou, Xian; Yan, Jianjun; Wang, Chengwei

doi:10.1016/j.physe.2014.05.003

Cited by 12 publications

(2 citation statements)

References 15 publications

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“…Among them, CdS films have an important role in applications such as light emitting diodes for flat panel displays, transistors for electronic switches [2]. It is known that CdS films can be deposited with either of two different structural phases like the hexagonal close packed (wurtzite) and the face-centred cubic (zinc blende or hawleyite) [3,4]. CdS films have high absorption coefficient and direct band gap material, and its optical band gap values are from 2.30 to 2.44 eV [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Kimyasal Banyo Depolama Yöntemi ile Elde Edilen CdS Filmlerinin Tavlama Sıcaklığının Kristal, Optiksel ve Yapısal Özellikleri Üzerine Etkisi

Aybek

Rüzgar

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

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Kadmiyum sülfür filmleri kimyasal banyo depolama yöntemi ile cam tabanlar üzerine biriktirildi. Elde edilen filmler azot gazında 1 saat boyunca 200-400 o C sıcaklık aralığında tavlandı. Filmlerin kristal yapısı x-ışını kırınım (XRD) desenlerinden belirlendi. XRD verileri, tavlama etkisiyle CdS (FCC) yapısından α-CdS (Hawleyite) formuna geçiş olduğunu gösterdi. Elde edilen CdS filmlerinin optiksel bant aralığı değerleri optiksel absorbans spetrumlarından yararlanılarak 2,33 ve 2,39 eV olarak belirlendi. Bant sarkmaları değerleri 120-350 meV arasında olduğu hesaplandı. Filmlerin görünür bölgede %45-92 arasında geçirgenlik değerlerine sahip olduğu belirlendi.

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Section: Introductionmentioning

confidence: 99%

Kimyasal Banyo Depolama Yöntemi ile Elde Edilen CdS Filmlerinin Tavlama Sıcaklığının Kristal, Optiksel ve Yapısal Özellikleri Üzerine Etkisi

Aybek

Rüzgar

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

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“…The synthesis of free-standing NT films is a promising way to generate NTs without the presence of a Ti metal substrate, resulting in both structure and phase stability up to a high temperature of approximately 600°C [ 23 ] or 700°C [ 24 ], although the fabrication process is tedious and inefficient. By rapid breakdown anodization [ 25 , 26 ], NT bundles in powder form can be prepared.…”

Section: Introductionmentioning

confidence: 99%

Anatase TiO2 nanotube powder film with high crystallinity for enhanced photocatalytic performance

et al. 2015

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We report on the synthesis of TiO2 nanotube (NT) powders using anodic oxidation and ultrasonication. Compared to free-standing NT array films, the powder-type NTs can be easily fabricated in a cost-effective way. Particularly, without the substrate effect arising from underlying Ti metals, highly crystallized NT powders with intact tube structures and pure anatase phase can be obtained using high-temperature heat treatment. The application of NTs with different crystallinity for the photocatalytic decomposition of methylene blue (MB) was then demonstrated. The results showed that with increasing annealing temperature, the photocatalytic decomposition rate was gradually enhanced, and the NT powder electrode annealed at 650°C showed the highest photoactivity. Compared to typical NTs annealed at 450°C, the rate constant increased by 2.7-fold, although the surface area was 21% lower. These findings indicate that the better photocatalytic activity was due to the significantly improved crystallinity of anatase anodic NTs in powder form, resulting in a low density of crystalline defects. This simple and efficient approach is applicable for scaled-up water purification and other light utilization applications.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-015-0814-6) contains supplementary material, which is available to authorized users.

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Enhanced Light Absorption and Photo‐Generated Charge Separation Efficiency for Boosting Photocatalytic H₂ Evolution through TiO₂ Quantum Dots with N‐Doping and Concomitant Oxygen Vacancy

Pan,

Zhu,

Liu

et al. 2024

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Low‐range light absorption and rapid recombination of photo‐generated charge carriers have prevented the occurrence of effective and applicable photocatalysis for decades. Quantum dots (QDs) offer a solution due to their size‐controlled photon properties and charge separation capabilities. Herein, well‐dispersed interstitial nitrogen‐doped TiO2 QDs with stable oxygen vacancies (N‐TiO2−x‐VO) are fabricated by using a low‐temperature, annealing‐assisted hydrothermal method. Remarkably, electrostatic repulsion prevented aggregation arising from negative charges accumulated in situ on the surface of N‐TiO2−x‐VO, enabling complete solar spectrum utilization (200–800 nm) with a 2.5 eV bandgap. Enhanced UV‐vis photocatalytic H2 evolution rate (HER) reached 2757 µmol g−1 h−1, 41.6 times higher than commercial TiO2 (66 µmol g−1 h−1). Strikingly, under visible light, HER rate was 189 µmol g−1 h−1. Experimental and simulated studies of mechanisms reveal that VO can serve as an electron reservoir of photo‐generated charge carriers on N‐doped active sites, and consequently, enhance the separation rate of exciton pairs. Moreover, the negative free energy (−0.35 V) indicates more favorable thermodynamics for HER as compared with bulk TiO2 (0.66 V). This research work paves a new way of developing efficient photocatalytic strategies of HER that are applicable in the sustainable carbon‐zero energy supply.

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Effect of annealing temperature on the photocatalytic activity of CdS-modified TNAs/glass nanotube arrays

Cited by 12 publications

References 15 publications

Kimyasal Banyo Depolama Yöntemi ile Elde Edilen CdS Filmlerinin Tavlama Sıcaklığının Kristal, Optiksel ve Yapısal Özellikleri Üzerine Etkisi

Kimyasal Banyo Depolama Yöntemi ile Elde Edilen CdS Filmlerinin Tavlama Sıcaklığının Kristal, Optiksel ve Yapısal Özellikleri Üzerine Etkisi

Anatase TiO2 nanotube powder film with high crystallinity for enhanced photocatalytic performance

Enhanced Light Absorption and Photo‐Generated Charge Separation Efficiency for Boosting Photocatalytic H₂ Evolution through TiO₂ Quantum Dots with N‐Doping and Concomitant Oxygen Vacancy

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Effect of annealing temperature on the photocatalytic activity of CdS-modified TNAs/glass nanotube arrays

Cited by 12 publications

References 15 publications

Kimyasal Banyo Depolama Yöntemi ile Elde Edilen CdS Filmlerinin Tavlama Sıcaklığının Kristal, Optiksel ve Yapısal Özellikleri Üzerine Etkisi

Kimyasal Banyo Depolama Yöntemi ile Elde Edilen CdS Filmlerinin Tavlama Sıcaklığının Kristal, Optiksel ve Yapısal Özellikleri Üzerine Etkisi

Anatase TiO2 nanotube powder film with high crystallinity for enhanced photocatalytic performance

Enhanced Light Absorption and Photo‐Generated Charge Separation Efficiency for Boosting Photocatalytic H2 Evolution through TiO2 Quantum Dots with N‐Doping and Concomitant Oxygen Vacancy

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Product

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Enhanced Light Absorption and Photo‐Generated Charge Separation Efficiency for Boosting Photocatalytic H₂ Evolution through TiO₂ Quantum Dots with N‐Doping and Concomitant Oxygen Vacancy