Synthesis and characterization of Zn-incorporated TiO2 thin films: impact of crystallite size on X-ray line broadening and bandgap tuning

Paul, Tapash Chandra; Podder, Jiban

doi:10.1007/s00339-019-3112-9

Cited by 43 publications

(17 citation statements)

References 57 publications

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“…Furthermore, we examined the XRD profiles by separating the broadening caused by the size and crystallinity, based on the Williamson− Hall method. 56 It was found that the broadening of the peaks in the XRD patterns in the present system is because of the effects of the size (∼90%) and crystal imperfection (∼10%) (Table S3). In conclusion, the HSQ polymer prepared using a higher methanol/water molar ratio gave Si-crystal-rich matrices with a darker brown color and contained Si nanocrystals with higher crystallinity and greater size.…”

Section: ■ Results and Discussionmentioning

confidence: 83%

“…Using three diffraction peaks corresponding to the (111), (220), and (311) Miller indices in Figure c, the average crystallite sizes and standard deviations 1σ in the matrices of the series 1, 2, and 3 samples were found to be 3.5 ± 0.2, 5.0 ± 0.4, and 5.5 ± 0.5 nm, respectively, as listed in Table . Furthermore, we examined the XRD profiles by separating the broadening caused by the size and crystallinity, based on the Williamson–Hall method . It was found that the broadening of the peaks in the XRD patterns in the present system is because of the effects of the size (∼90%) and crystal imperfection (∼10%) (Table S3).…”

Section: Resultsmentioning

confidence: 99%

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Cost-Effective Synthesis of Silicon Quantum Dots

2020

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Silicon (Si) nanomaterials with bright luminescence in the visible region are promising materials for use as the nextgeneration light source in displays, lighting, and biomedical imaging. A scalable and cost-effective method for the synthesis of Si quantum dots (SiQDs) is essential for research and development in the field of quantum dots. Herein, we show a facile and costeffective method for controlling the structure and properties of SiQDs, obtained using the pyrolysis of hydrogen silsesquioxane (HSQ) polymer precursors synthesized using methanol. The amount of methanol added to trichlorosilane prior to the addition of water is a key factor that determines the structure and crosslinking density of the HSQ polymer used as the precursor. In turn, these features control the SiQD size, crystallinity, and luminescence efficiency. Dodecyl-passivated SiQDs of size 3−4 nm are obtained as a final product and show red photoluminescence (PL) at approximately 700−800 nm with the peak wavelength depending on the size of SiQDs. The PL quantum yield ranged from 10 to 25% with the highest value obtained for the smaller SiQDs with higher crystallinity. The present study provides new insight into the SiQD synthesis procedure and the understanding of the reaction mechanism. Furthermore, it was found that only methanol is the crucial reagent and the facile and cost-effective synthesis method can be controlled merely by changing the amount of methanol.

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Section: ■ Results and Discussionmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Cost-Effective Synthesis of Silicon Quantum Dots

2020

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“…Meanwhile, the diffractions arising from PeNCs broaden and decrease in intensity with increasing MPTMS concentration. Taking into account the increased size of the NCs, the broadening is contributed by an intensive lattice strain within the ExMP-CsPbBr 3 . For ExMP treatment of a 10 mg/mL CsPbBr 3 PeNC dispersion in hexane, the optimal siloxane concentration is determined to be 1.5 vol % or 0.08 M according to PL intensity evolution in Figure S2, and the corresponding PXRD in Figure a exhibits minimal background diffractions.…”

Section: Resultsmentioning

confidence: 99%

Strain Modulation for High Brightness Blue Luminescence of Pr³⁺-Doped Perovskite Nanocrystals via Siloxane Passivation

Wang

Zhang

Zhuo

et al. 2021

ACS Appl. Electron. Mater.

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High performance CsPbBr 3 nanocrystals (NCs) were synthesized via a hot injection method followed by a room-temperature ligand exchange modification using 3-mercaptopropyltrimethoxysilane (MPTMS). The ligand exchange promotes crystal growth and enhances the photoluminescence quantum yield (PLQY) of the NCs to near unity. The oscillator strength of the interband transition based on UV−vis absorption was surprisingly amplified by a factor of 2.5. The NC's surface was passivated via S−Pb polar covalent bonding, which shifts the thermodynamic equilibrium and favors NC growth with a higher Br-to-Pb atomic ratio on the surface. Moreover, the perovskite lattice was strained by a cross-linked polymeric network of self-condensed siloxane. The strain within CsPbBr 3 NCs was modulated by mixing at room temperature with Cs 3 PrCl 6 NCs for controlled halide exchange and Pr doping; thereby blue emission from the Pr-doped CsPb(Cl/Br) 3 NCs was achieved with optimized brightness (PLQY = 88%) at 464 nm.

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“…The TiO 2 nanopowder sintered at 700°C was exposed to ultraviolet light for only 60 min, and the degradation rate of MB reached more than 95%, indicating that it has a good application prospect. In addition, it is of great significance to prepare photocatalysts with high degradation rate of organic matter by the economical and simple preparation method of sol–gel method compared to other complex preparing method [17–19].…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the Zn‐doped TiO 2 thin film was synthesised by a thermal spray pyrolysis technique with an aim to investigate the influence of Zn doping on the structural, morphological, optical and the electrical properties of TiO 2 nanoparticles. The results indicate that the crystallite size and the lattice strain evaluated are highly intercorrelated [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treating process on phase transformation and photocatalytic activity of Zn‐doped nano‐titania

Bao

Tian

Gerile

et al. 2020

Micro & Nano Letters

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Synthesis and characterization of Zn-incorporated TiO2 thin films: impact of crystallite size on X-ray line broadening and bandgap tuning

Cited by 43 publications

References 57 publications

Cost-Effective Synthesis of Silicon Quantum Dots

Cost-Effective Synthesis of Silicon Quantum Dots

Strain Modulation for High Brightness Blue Luminescence of Pr³⁺-Doped Perovskite Nanocrystals via Siloxane Passivation

Effect of heat treating process on phase transformation and photocatalytic activity of Zn‐doped nano‐titania

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Synthesis and characterization of Zn-incorporated TiO2 thin films: impact of crystallite size on X-ray line broadening and bandgap tuning

Cited by 43 publications

References 57 publications

Cost-Effective Synthesis of Silicon Quantum Dots

Cost-Effective Synthesis of Silicon Quantum Dots

Strain Modulation for High Brightness Blue Luminescence of Pr3+-Doped Perovskite Nanocrystals via Siloxane Passivation

Effect of heat treating process on phase transformation and photocatalytic activity of Zn‐doped nano‐titania

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Strain Modulation for High Brightness Blue Luminescence of Pr³⁺-Doped Perovskite Nanocrystals via Siloxane Passivation