Properties of Lead-Sulfide Nanoparticles in a Multicrystalline Structure
| Autor: | M. I. Shishkin, A. G. Rokakh, N. D. Zhukov |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Total internal reflection Materials science Scanning electron microscope Analytical chemistry Nanoparticle 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Chemical reaction Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry 0103 physical sciences Microscopy Lead sulfide Fourier transform infrared spectroscopy 0210 nano-technology Quantum tunnelling |
| Zdroj: | Semiconductors. 52:755-759 |
| ISSN: | 1090-6479 1063-7826 |
| DOI: | 10.1134/s1063782618060258 |
| Popis: | The structural and electrical properties of PbS nanoparticles (40–70 nm), produced by a chemical reaction of sodium hydroxide with lead nitrate and electrophoretically deposited onto a conductive substrate, are investigated. The composition and structure of the nanoparticles are identified by X-ray analysis as pure PbS phase with a face-centered cubic lattice. Several minima, related to plasma-resonance absorption at 10–17 μm, are observed in the frustrated total internal reflection (FTIR) spectra. The layer morphology and the nanoparticle shape and sizes are determined by scanning electron and tunneling microscopy. The threedimensional topograms show that the surface fine structure is a set of faceted pyramidal spikes with a size of 5–10 nm and a density of ~400 μm–2. An analysis of the tunneling current–voltage characteristics of individual nanospikes shows the presence of low-field emission and makes it possible to determine the barrier heights (1.6–1.8 eV), which are explained within the quantum-dot (QD) model. |
| Databáze: | OpenAIRE |
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