1
|
Ilickas M, Mardosaite R, Cesano F, Cravanzola S, Barolo C, Scarano D, Viscardi G, Rackauskas S. ZnO tetrapod morphology influence on UV sensing properties. NANOTECHNOLOGY 2023; 35:015502. [PMID: 37748455 DOI: 10.1088/1361-6528/acfcbf] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 09/24/2023] [Indexed: 09/27/2023]
Abstract
The aim of this work was to investigate how ZnO tetrapod (ZnO-T) morphology, structure, and surface charge properties (i.e. Debye length) influence their UV sensing properties, shedding light on the underlying photoresponse mechanisms. ZnO-Ts were synthesized and centrifuged to obtain three different fractions with tuned morphology, which were characterized by scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy microscopies, x-ray diffraction analysis, Brunauer-Emmett-Teller measurements, FTIR and UV-vis spectroscopies. ZnO-T UV sensors were fabricated and tested comparing among ZnO-T fractions and commercial ZnO nanoparticles. ZnO-T photoresponse was mostly influenced by ZnO-T leg diameter, with the optimal value close to the double Debye length. We also demonstrated how fractionating ZnO-Ts for morphology optimization can increased the responsivity by 2 orders of magnitude. Moreover, ZnO-T showed 3 orders of magnitude higher responsivity compared to commercial ZnO nanopowder. These results are beneficial for the engineering of efficient UV sensors and contribute to a deeper understanding the overall mechanism governing UV photoresponse.
Collapse
Affiliation(s)
- Mindaugas Ilickas
- Institute of Materials Science, Kaunas University of Technology, K. Barsausko St. 59, 51423 Kaunas, Lithuania
| | - Rasa Mardosaite
- Institute of Materials Science, Kaunas University of Technology, K. Barsausko St. 59, 51423 Kaunas, Lithuania
- Department of Physics, Kaunas University of Technology, Studentu St. 50, 51368 Kaunas, Lithuania
| | - Federico Cesano
- Department of Chemistry, NIS Interdepartmental Centre and INSTM Reference Centre, University of Turin, Via Pietro Giuria 7, I-10125 Turin, Italy
| | - Sara Cravanzola
- Department of Chemistry, NIS Interdepartmental Centre and INSTM Reference Centre, University of Turin, Via Pietro Giuria 7, I-10125 Turin, Italy
| | - Claudia Barolo
- Department of Chemistry, NIS Interdepartmental Centre and INSTM Reference Centre, University of Turin, Via Pietro Giuria 7, I-10125 Turin, Italy
| | - Domenica Scarano
- Department of Chemistry, NIS Interdepartmental Centre and INSTM Reference Centre, University of Turin, Via Pietro Giuria 7, I-10125 Turin, Italy
| | - Guido Viscardi
- Department of Chemistry, NIS Interdepartmental Centre and INSTM Reference Centre, University of Turin, Via Pietro Giuria 7, I-10125 Turin, Italy
| | - Simas Rackauskas
- Institute of Materials Science, Kaunas University of Technology, K. Barsausko St. 59, 51423 Kaunas, Lithuania
- Department of Physics, Kaunas University of Technology, Studentu St. 50, 51368 Kaunas, Lithuania
| |
Collapse
|
2
|
Scarano D, Cesano F. Graphene and Other 2D Layered Nanomaterials and Hybrid Structures: Synthesis, Properties and Applications. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7108. [PMID: 34885263 PMCID: PMC8658133 DOI: 10.3390/ma14237108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 11/15/2021] [Indexed: 11/25/2022]
Abstract
The field of two-dimensional (2D) layered nanomaterials, their hybrid structures, and composite materials has been suddenly increasing since 2004, when graphene-almost certainly the most known 2D material-was successfully obtained from graphite via mechanical exfoliation [...].
Collapse
Affiliation(s)
| | - Federico Cesano
- Department of Chemistry and NIS Interdepartmental Centre, University of Torino, Via P. Giuria 7, 10125 Torino, Italy;
| |
Collapse
|
3
|
Abstract
The exfoliation of graphene has opened a new frontier in material science with a focus on 2D materials. The unique thermal, physical and chemical properties of these materials have made them one of the choicest candidates in novel mechanical and nano-electronic devices. Notably, 2D materials such as graphene, MoS2, WS2, h-BN and black phosphorus have shown outstanding lowest frictional coefficients and wear rates, making them attractive materials for high-performance nano-lubricants and lubricating applications. The objective of this work is to provide a comprehensive overview of the most recent developments in the tribological potentials of 2D materials. At first, the essential physical, wear and frictional characteristics of the 2D materials including their production techniques are discussed. Subsequently, the experimental explorations and theoretical simulations of the most common 2D materials are reviewed in regards to their tribological applications such as their use as solid lubricants and surface lubricant nano-additives. The effects of micro/nano textures on friction behavior are also reviewed. Finally, the current challenges in tribological applications of 2D materials and their prospects are discussed.
Collapse
|
4
|
Molecules and heterostructures at TiO2 surface: the cases of H2O, CO2, and organic and inorganic sensitizers. RESEARCH ON CHEMICAL INTERMEDIATES 2019. [DOI: 10.1007/s11164-019-04003-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
5
|
Świercz R, Oniszczuk-Świercz D. Investigation of the Influence of Reduced Graphene Oxide Flakes in the Dielectric on Surface Characteristics and Material Removal Rate in EDM. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E943. [PMID: 30901872 PMCID: PMC6471018 DOI: 10.3390/ma12060943] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 03/13/2019] [Accepted: 03/16/2019] [Indexed: 11/25/2022]
Abstract
Electrical discharge machining (EDM) is an advanced technology used to manufacture difficult-to-cut conductive materials. However, the surface layer properties after EDM require additional finishing operations in many cases. Therefore, new methods implemented in EDM are being developed to improve surface characteristics and the material removal rate. This paper presents new research about improving the surface integrity of 55NiCrMoV7 tool steel by using reduced graphene oxide (RGO) flakes in the dielectric. The main goal of the research was to investigate the influence of RGO flakes in the dielectric on electrical discharge propagation and heat dissipation in the gap. The investigation of the influence of discharge current I and pulse time ton during EDM with RGO flakes in the dielectric was carried out using response surface methodology. Furthermore, the surface texture properties and metallographic structure after EDM with RGO in the dielectric and conventional EDM were investigated and described. The obtained results indicate that using RGO flakes in the dielectric leads to a decreased surface roughness and recast layer thickness with an increased material removal rate (MRR). The presence of RGO flakes in the dielectric reduced the breakdown voltage and allowed several discharges to occur during one pulse. The dispersion of the discharge caused a decrease in the energy delivered to the workpiece. In terms of the finishing EDM parameters, there was a 460% reduction in roughness Ra with a uniform distribution of the recast layer on the surface, and a slight increase in MRR (12%) was obtained.
Collapse
Affiliation(s)
- Rafał Świercz
- Institute of Manufacturing Technology, Warsaw University of Technology, 00-661 Warsaw, Poland.
| | | |
Collapse
|