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Zheng S, Duley WW, Peng P, Zhou N. Laser modification of Au-CuO-Au structures for improved electrical and electro-optical properties. NANOTECHNOLOGY 2022; 33:245205. [PMID: 35255484 DOI: 10.1088/1361-6528/ac5b52] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 03/07/2022] [Indexed: 06/14/2023]
Abstract
CuO nanomaterials are one of the metal-oxides that received extensive investigations in recent years due to their versatility for applications in high-performance nano-devices. Tailoring the device performance through the engineering of properties in the CuO nanomaterials thus attracted lots of effort. In this paper, we show that nanosecond (ns) laser irradiation is effective in improving the electrical and optoelectrical properties in the copper oxide nanowires (CuO NWs). We find that ns laser irradiation can achieve joining between CuO NWs and interdigital gold electrodes. Meanwhile, the concentration and type of point defects in CuO can be controlled by ns laser irradiation as well. An increase in the concentration of defect centers, together with a reduction in the potential energy barrier at the Au/CuO interfaces due to laser irradiation increases electrical conductivity and enhances photo-conductivity. We demonstrate that the enhanced electrical and photo-conductivity achieved through ns laser irradiation can be beneficial for applications such as resistive switching and photo-detection.
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Affiliation(s)
- Shuo Zheng
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, Ontario, N2L 3G1, Waterloo, Canada
- Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
| | - Walter W Duley
- Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
| | - Peng Peng
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, Ontario, N2L 3G1, Waterloo, Canada
- Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
| | - Norman Zhou
- Department of Mechanical and Mechatronics Engineering, University of Waterloo, Ontario, N2L 3G1, Waterloo, Canada
- Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
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Wang CC, Lin PT, Shieu FS, Shih HC. Enhanced Photocurrent of the Ag Interfaced Topological Insulator Bi 2Se 3 under UV- and Visible-Light Radiations. NANOMATERIALS 2021; 11:nano11123353. [PMID: 34947704 PMCID: PMC8705254 DOI: 10.3390/nano11123353] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/05/2021] [Accepted: 12/08/2021] [Indexed: 11/16/2022]
Abstract
Bi2Se3 is a topological quantum material that is used in photodetectors, owing to its narrow bandgap, conductive surface, and insulating bulk. In this work, Ag@Bi2Se3 nanoplatelets were synthesized on Al2O3(100) substrates in a two-step process of thermal evaporation and magnetron sputtering. X-ray diffractometer (XRD), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, and x-ray photoelectron spectroscopy (XPS) revealed that all samples had the typical rhombohedral Bi2Se3. Field-emission scanning electron microscopy (FESEM)-energy dispersive x-ray spectroscopy (EDS), XPS, and HRTEM confirmed the presence of the precipitated Ag. The optical absorptance of Bi2Se3 nanoplatelets in UV-visible range decreased with the Ag contents. Results of photocurrent measurements under zero-bias conditions revealed that the deposited Ag affected photosensitivity. A total of 7.1 at.% Ag was associated with approximately 4.25 and 4.57 times higher photocurrents under UV and visible light, respectively, than 0 at.% Ag. The photocurrent in Bi2Se3 at 7.1 at.% Ag under visible light was 1.72-folds of that under UV light. This enhanced photocurrent is attributable to the narrow bandgap (~0.35 eV) of Bi2Se3 nanoplatelets, the Schottky field at the interface between Ag and Bi2Se3, the surface plasmon resonance that is caused by Ag, and the highly conductive surface that is formed from Ag and Bi2Se3. This work suggests that the appropriate Ag deposition enhances the photocurrent in, and increases the photosensitivity of, Bi2Se3 nanoplatelets under UV and visible light.
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Affiliation(s)
- Chih-Chiang Wang
- Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan;
- International Agriculture Center, National Chung Hsing University, Taichung 40227, Taiwan
| | - Pao-Tai Lin
- Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843, USA;
| | - Fuh-Sheng Shieu
- Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan;
- Correspondence: (F.-S.S.); (H.-C.S.)
| | - Han-Chang Shih
- Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan;
- Department of Chemical Engineering and Materials Science, Chinese Culture University, Taipei 11114, Taiwan
- Correspondence: (F.-S.S.); (H.-C.S.)
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Gonzalez-Martinez IG, Bachmatiuk A, Gemming T, Cuniberti G, Trzebicka B, Rummeli MH. Room temperature single-step synthesis of metal decorated boron-rich nanowires via laser ablation. NANO CONVERGENCE 2019; 6:14. [PMID: 31065822 PMCID: PMC6504969 DOI: 10.1186/s40580-019-0185-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 04/05/2019] [Indexed: 05/04/2023]
Abstract
Hybrid nanostructures, such as those with nanoparticles anchored on the surface of nanowires, or decorated nanowires, have a large number of potential and tested applications such as: gas sensing, catalysis, plasmonic waveguides, supercapacitors and more. The downside of these nanostructures is their production. Generally, multi-step synthesis procedures are used, with the nanowires and the nanoparticles typically produced separately and then integrated. The few existent single-step methods are lengthy or necessitate highly dedicated setups. In this paper we report a single-step and rapid (ca. 1 min) laser ablation synthesis method which produces a wide variety of boron-rich decorated nanowires. Furthermore, the method is carried at room temperature. The synthesis process consists on a filamentary jet ejection process driven by pressure gradients generated by the ablation plume on the rims of the irradiation crater. Simultaneously nanoparticles are nucleated and deposited on the filaments thus producing hybrid decorated nanowires.
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Affiliation(s)
- Ignacio G Gonzalez-Martinez
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, 41-819, Zabrze, Poland
| | - Alicja Bachmatiuk
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, 41-819, Zabrze, Poland
| | - Thomas Gemming
- Leibniz Institute for Solid State Research Dresden (IFW Dresden), Helmholtz Strasse 20, 01171, Dresden, Germany
| | - Gianaurelio Cuniberti
- Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062, Dresden, Germany
| | - Barbara Trzebicka
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, 41-819, Zabrze, Poland
| | - Mark H Rummeli
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, 41-819, Zabrze, Poland.
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Meyns M, Willing S, Lehmann H, Klinke C. Metal Domain Size Dependent Electrical Transport in Pt-CdSe Hybrid Nanoparticle Monolayers. ACS NANO 2015; 9:6077-87. [PMID: 26052966 DOI: 10.1021/acsnano.5b01221] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Thin films prepared of semiconductor nanoparticles are promising for low-cost electronic applications such as transistors and solar cells. One hurdle for their breakthrough is their notoriously low conductivity. To address this, we precisely decorate CdSe nanoparticles with platinum domains of one to three nanometers in diameter by a facile and robust seeded growth method. We demonstrate the transition from semiconductor to metal dominated conduction in monolayered films. By adjusting the platinum content in such solution-processable hybrid, oligomeric nanoparticles the dark currents through deposited arrays become tunable while maintaining electronic confinement and photoconductivity. Comprehensive electrical measurements allow determining the reigning charge transport mechanisms.
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Affiliation(s)
- Michaela Meyns
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
| | - Svenja Willing
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
| | - Hauke Lehmann
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
| | - Christian Klinke
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
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Zhang YF, Yang DJ, Wang JH, Wang YL, Ding SJ, Zhou L, Hao ZH, Wang QQ. Multiple hybridized resonances of IR-806 chromonic molecules strongly coupled to Au nanorods. NANOSCALE 2015; 7:8503-8509. [PMID: 25896476 DOI: 10.1039/c5nr00051c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Strong coupling of plasmons and molecules generates intriguingly hybridized resonance. The IR-806 molecule is a near-infrared cyanine liquid crystal dye with multiple molecular bands and its tunable absorption spectrum varies dramatically with concentration. In this article, we investigate multiple hybridized resonances of the Au nanorods (AuNRs) strongly coupled to IR-806 molecules. Five hybridized resonance peaks are observed in the extinction spectra of the AuNR@IR-806 hybrids. Two resonance peaks at approximately 840 and 912 nm in the hybrids are reported for the first time. The dependence of the multiple hybridized peaks on the bare plasmon resonance wavelength of AuNRs and the molecular concentration is also demonstrated. The observations presented herein provide a plasmon-molecule coupling route for tuning optical responses of liquid crystal molecules.
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Affiliation(s)
- Ya-Fang Zhang
- Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, and School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
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