Enhanced photoconductivity in SnO2-ZnS nanocomposites: nano-structural, optical, and electrical investigations

IF 2.6 4区材料科学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of Nanoparticle Research Pub Date : 2025-06-27 DOI:10.1007/s11051-025-06373-4

Alison Christina Fernandez, Sakthivel P, Gopala Krishnan V, Priyadharsini N

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Abstract

This study presents the synthesis of SnO₂-ZnS nanocomposites using a one-step hydrothermal sintering technique with precursor ratios of 25:75, 50:50, and 75:25. Characterization techniques confirmed the successful formation of the composites. XRD analysis indicated the occurrence of tetragonal SnO₂ and cubic ZnS phases with crystallite sizes between 20 and 40 nm. EDAX and FTIR analyses validated the elemental composition and functional groups of the nanocomposites. The crystallite size, dislocation density, and lattice strain were determined using the W–H and Scherrer formulas, with the phase combination further confirmed by the Rietveld refinement. UV–Visible spectrometer analysis showed a blue shift for all ratios, with an excitation wavelength around 332 nm. SEM micrographs revealed spherical cluster morphology for all ratios. Electrical analysis, performed using an LCR meter and Keithley 6514 electrometer, demonstrated a high dielectric constant at low frequencies, which decreased with lower ZnS concentration. Enhanced photo response characteristics were also observed.

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SnO2-ZnS纳米复合材料的增强光导电性：纳米结构、光学和电学研究

采用一步水热烧结法合成了SnO₂-ZnS纳米复合材料，前驱体比例分别为25:75、50:50和75:25。表征技术证实了复合材料的成功形成。XRD分析表明，晶粒尺寸在20 ~ 40 nm之间，存在四方SnO 2和立方ZnS相。EDAX和FTIR分析验证了纳米复合材料的元素组成和官能团。采用W-H和Scherrer公式确定了晶粒尺寸、位错密度和晶格应变，并通过Rietveld精化进一步证实了相组合。紫外-可见光谱分析显示，在激发波长约为332 nm的情况下，所有比率都发生了蓝移。SEM显微图显示所有比例的球形团簇形态。使用LCR计和Keithley 6514静电计进行的电分析表明，低频时介电常数较高，随着ZnS浓度的降低而降低。还观察到增强的光响应特性。

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来源期刊

Journal of Nanoparticle Research 工程技术-材料科学：综合

CiteScore

4.40

自引率

4.00%

发文量

198

审稿时长

3.9 months

期刊介绍： The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size. Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology. The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.