A study on structure, morphology, optical properties, and photocatalytic ability of SrTiO 3 /TiO 2 granular composites

The composition, structure, morphology, and optical characteristics of hydrogenated amorphous silicon-oxycarbide (a-SiCxOyHz) materials were investigated as a function of experimental processing conditions and post-deposition thermal treatment. Thermal chemical vapor deposition (TCVD) was applied to the growth of three different types of a-SiCxOyHz films, namely, SiC-like (SiC1.08O0.07H0.21), Si-C-O (SiC0.50O1.20H0.22), and SiO2-like (SiC0.20O1.70H0.24). The resulting films were subsequently annealed at temperatures ranging from 500 °C to 1100 °C for 1 h in an argon atmosphere. The composition, structure, and morphology of as-deposited and post-annealed films were characterized by Fourier transform infrared spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS), Rutherford backscattering spectroscopy (RBS), nuclear-reaction analysis (NRA), and scanning electron microscopy. Corresponding optical properties were assessed by spectroscopic ultraviolet-visible ellipsometry (UV-VIS-SE). These studies led to the identification of an optimized process window for the growth of Er doped silicon oxycarbide (SiC0.5O1.0:Er) thin film with strong room-temperature photoluminescence emission measured around 1540 nm within a broad (460 nm to 600 nm) wavelength band. Associated modeling studies showed that the effective cross section for Er excitation in the SiC0.5O1.0:Er matrix was approximately four orders of magnitude larger than its analog for direct optical excitation of Er ions.

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Synthesis and optical properties of single-crystalline SnS1−xSex nanobelts

Powder Diffraction ◽

10.1017/s0885715620000615 ◽

2020 ◽

Vol 35 (4) ◽

pp. 276-281

Author(s):

Shengru Wang ◽

Xiaofang Lai ◽

Bingsheng Du ◽

Junhao Ma ◽

Peihua Wang ◽

...

Keyword(s):

Optical Properties ◽

Optical Property ◽

Doping Concentration ◽

Band Gaps ◽

Phonon Modes ◽

Facile Hydrothermal Method ◽

One Dimensional ◽

Optical Band Gaps ◽

Structure Morphology ◽

Se Doping

In this work, SnS1−xSex ternary nanobelts were synthesized by a facile hydrothermal method without the assistance of surfactants. The structure, morphology, microstructure, compositions, chemical valences, phonon modes, and optical band gaps of the SnS1−xSex nanobelts were characterized in detail. The results indicate that the SnS1−xSex nanobelts have uniform one-dimensional morphology and are single crystals with high crystallinity. Se is incorporated into the SnS lattice to substitute for S-forming ternary SnS1−xSex alloy. With the increase of Se doping concentration, the optical band gaps of the nanobelts gradually decrease from 1.15 to 1.01 eV, confirming the tunable optical property achieved here.

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Structure, Morphology and Optical Properties of TiO2 Films Formed by Anodizing in a Mixed Solution of Citric Acid and Sulfamic Acid

Journal of Materials Engineering and Performance ◽

10.1007/s11665-017-2818-0 ◽

2017 ◽

Vol 26 (8) ◽

pp. 4001-4010 ◽

Cited By ~ 1

Author(s):

R. K. Choudhary ◽

P. Sarkar ◽

A. Biswas ◽

P. Mishra ◽

G. J. Abraham ◽

...

Keyword(s):

Optical Properties ◽

Citric Acid ◽

Sulfamic Acid ◽

Mixed Solution ◽

Tio2 Films ◽

Structure Morphology

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Structure, morphology and optical properties of thermally evaporated Cu2S thin films annealed at different temperatures

10.1063/1.5123091 ◽

2019 ◽

Cited By ~ 1

Author(s):

Bushra A. Hasan ◽

Mohammed Abdalhur Kadhim

Keyword(s):

Thin Films ◽

Optical Properties ◽

Structure Morphology ◽

Different Temperatures

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Effects of Annealing Temperature on the Crystal Structure, Morphology, and Optical Properties of Peroxo-Titanate Nanotubes Prepared by Peroxo-Titanium Complex Ion

Nanomaterials ◽

10.3390/nano10071331 ◽

2020 ◽

Vol 10 (7) ◽

pp. 1331 ◽

Cited By ~ 1

Author(s):

Hyunsu Park ◽

Tomoyo Goto ◽

Sunghun Cho ◽

Soo Wohn Lee ◽

Masato Kakihana ◽

...

Keyword(s):

Crystal Structure ◽

Optical Properties ◽

Precursor Solution ◽

Titanate Nanotubes ◽

Layered Compound ◽

Alkali Concentration ◽

Complex Ions ◽

Nanotubular Structure ◽

Structure Morphology ◽

Hydrogen Titanate

This study addresses the effects of annealing temperatures (up to 500 °C) on the crystal structure, morphology, and optical properties of peroxo groups (–O–O–) containing titanate nanotubes (PTNTs). PTNTs, which possess a unique tubular morphology of layered-compound-like hydrogen titanate structure (approximately 10 nm in diameter), were synthesized using peroxo-titanium (Ti–O–O) complex ions as a precursor under very mild conditions—temperature of 100 °C and alkali concentration of 1.5 M—in the precursor solution. The nanotubular structure was dismantled by annealing and a nanoplate-like structure within the range of 20–50 nm in width and 100–300 nm in length was formed at 500 °C via a nanosheet structure by decreasing the specific surface area. Hydrogen titanate-based structures of the as-synthesized PTNTs transformed directly into anatase-type TiO2 at a temperature above 360 °C due to dehydration and phase transition. The final product, anatase-based titania nanoplate, was partially hydrogen titanate crystal in nature, in which hydroxyl (–OH) bonds exist in their interlayers. Therefore, the use of Ti–O–O complex ions contributes to the improved thermal stability of hydrogen titanate nanotubes. These results show a simple and environmentally friendly method that is useful for the synthesis of functional nanomaterials for applications in various fields.

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