Optical and Electrical Properties of Nano- and Microcrystals

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: 10 October 2025 | Viewed by 961

Special Issue Editor


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Guest Editor
National Energy Technology Laboratory (NETL), United States Department of Energy (U.S. DOE), Pittsburgh, PA 15236, USA
Interests: electronic and optical properties; multi-scale modeling; crystal structure predictions; nanomaterials; energy materials

Special Issue Information

Dear Colleagues,

This Special Issue aims to cover a wide range of studies in the growth, fabrication, and characterization of nano- and microcrystals. Nanotechnology has shown excellent application value and prospects in all walks of life. Nanomaterials, especially nano- and microcrystals, have extremely important applications in optics, optoelectronics, integrated circuits, sensors, and biomedicine. The qualities/orientations/structures/symmetry of the nano- and microcrystals determine the intriguing properties of the material. Investigations of the novel methods and theoretical analysis in the growth of nano- and microcrystals develop more exciting performance enhancements and discover huge potential application perspectives. Additionally, the manufacturing techniques in nano- and micro size also stimulate the excellent performance of the material. 

We invite you to publish papers in the forms of original research articles, communications, review articles, and perspective views that present recent progress of either analytical, numerical, or experimental methods to advance the field of nano- and microcrystals.

Dr. Yuhua Duan
Guest Editor

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Keywords

  • nano- and microcrystals
  • material growth methods
  • material characterization
  • semiconductor materials 
  • optoelectronic devices
  • nanoscale fabrication techniques
  • multi-scale modeling
  • energy systems

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Published Papers (2 papers)

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Research

14 pages, 2032 KiB  
Article
Mechanochemically Synthesized Skinnerite Cu3SbS3 and Wittichenite Cu3BiS3 Nanocrystals and Their Promising Thermoelectric Properties
by Erika Dutková, Petr Levinský, Jiří Hejtmánek, Karel Knížek, Lenka Findoráková, Matej Baláž, Martin Fabián, Katarína Gáborová, Viktor Puchý and Peter Baláž
Crystals 2025, 15(6), 511; https://doi.org/10.3390/cryst15060511 - 27 May 2025
Viewed by 391
Abstract
The thermoelectric properties of skinnerite Cu3SbS3 and wittichenite Cu3BiS3 prepared by mechanochemical synthesis in a planetary ball mill from elemental precursors were investigated for the first time. X-ray diffraction (XRD) analysis of skinnerite after heat treatment revealed [...] Read more.
The thermoelectric properties of skinnerite Cu3SbS3 and wittichenite Cu3BiS3 prepared by mechanochemical synthesis in a planetary ball mill from elemental precursors were investigated for the first time. X-ray diffraction (XRD) analysis of skinnerite after heat treatment revealed not only the presence of monoclinic skinnerite phase but also the presence of tetrahedrite phases. XRD analysis of wittichenite after both heat treatment and spark plasma sintering (SPS) revealed the presence of only the prepared orthorhombic wittichenite, whereas, in the case of skinnerite, not only skinnerite but also tetrahedrite is present after SPS treatment. The thermal stability of mechanochemically synthesized Cu3SbS3 and Cu3BiS3 samples was investigated by thermal analysis, which confirmed that Cu3SbS3 is thermally stable up to 604 K and Cu3BiS3 up to 550 K, respectively. Thermoelectric (TE) potential was evaluated by measuring the Seebeck coefficient, electrical and thermal conductivity, and figure of merit ZT. The performed thermoelectric (TE) measurements revealed a figure of merit ZT of 0.69 and 0.09 at 575 K for pristine skinnerite and wittichenite, respectively, sintered by SPS. The combination of mechanosynthesis followed by SPS allows for the preparation of materials that display a promising thermoelectric response. This approach opens up new possibilities for enhancing the thermoelectric properties of materials, which could have significant implications for various applications, such as energy conversion and waste heat recovery. Further research in this area is necessary to fully explore and exploit the potential of these materials for thermoelectric applications. Full article
(This article belongs to the Special Issue Optical and Electrical Properties of Nano- and Microcrystals)
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12 pages, 2085 KiB  
Article
Investigation of Dielectric and Sensing Behavior of Anodic Aluminum Oxide Filled by Carbyne-Enriched Nanomaterial
by Mariya Aleksandrova, Tsvetozar Tsanev and Dilyana N. Gospodinova
Crystals 2025, 15(4), 314; https://doi.org/10.3390/cryst15040314 - 27 Mar 2025
Viewed by 358
Abstract
Anodic aluminum oxide (AAO) is a promising material for sensor applications due to its unique nanoporous structure and high surface area. This study investigates enhancing AAO’s sensing capabilities by incorporating carbyne-enriched nanomaterials. This research aimed to create a novel surface acoustic wave (SAW) [...] Read more.
Anodic aluminum oxide (AAO) is a promising material for sensor applications due to its unique nanoporous structure and high surface area. This study investigates enhancing AAO’s sensing capabilities by incorporating carbyne-enriched nanomaterials. This research aimed to create a novel surface acoustic wave (SAW) sensor with improved performance characteristics. AAO films were fabricated using a two-step anodization process, followed by carbyne-enriched coating deposition via ion-assisted pulse-plasma deposition. The dielectric properties of the resulting composite material were characterized using impedance spectroscopy, while the sensing performance was evaluated by exposing the sensor to various ethanol concentrations. The results showed a significant increase in capacitance and dielectric permittivity for the carbyne-filled AAO compared to pristine AAO, along with a 5-fold improvement in sensitivity to ethanol vapor. The increased sensitivity is attributed to the synergistic combination of the AAO’s high surface area and the carbyne’s unique electrical properties. This work demonstrates the successful fabrication and characterization of a novel high-sensitivity gas sensor, highlighting the potential of carbyne-enriched AAO for advanced sensor applications. Full article
(This article belongs to the Special Issue Optical and Electrical Properties of Nano- and Microcrystals)
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