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Yan ZX, Zhang YL, Wang W, Fu XY, Jiang HB, Liu YQ, Verma P, Kawata S, Sun HB. Superhydrophobic SERS Substrates Based on Silver-Coated Reduced Graphene Oxide Gratings Prepared by Two-Beam Laser Interference. ACS APPLIED MATERIALS & INTERFACES 2015; 7:27059-27065. [PMID: 26595745 DOI: 10.1021/acsami.5b09128] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Reported here is the fabrication of reduced graphene oxide (RGO) grating structures by two-beam laser interference (TBLI) for the development of highly efficient SERS substrates via simple physical vapor deposition (PVD) coating of silver. TBLI has been utilized to make hierarchical RGO grating structures with microscale gratings and nanoscale folders through a laser treatment induced ablation and photoreduction process. The hierarchical structures contribute to the formation of plasmonic structures after silver coating, giving rise to the formation of plenty of SERS "hot spots", while the RGO substrate would provide chemical enhancement of Raman signal through interaction with analytes molecules. The significantly increased roughness with respect to the hierarchical structures in combination with the removal of hydrophilic oxygen-containing groups endow the resultant substrates with unique superhydrophobicity, which leads to the enrichment of analytes and further lowers the detection limit. The synergistic effects make the silver coated RGO gratings a highly efficient SERS substrate; in the detection of Rhodamine B, our SERS substrates showed high SERS enhancement and good reproducibility, a detection limit of 10(-10) M has been achieved.
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Affiliation(s)
- Zhao-Xu Yan
- Department of Applied Physics, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yong-Lai Zhang
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, China
| | - Wei Wang
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, China
| | - Xiu-Yan Fu
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, China
| | - Hao-Bo Jiang
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, China
| | - Yu-Qing Liu
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, China
| | - Prabhat Verma
- Department of Applied Physics, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Satoshi Kawata
- Department of Applied Physics, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hong-Bo Sun
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, China
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Shi X, Li X, Jiang L, Qu L, Zhao Y, Ran P, Wang Q, Cao Q, Ma T, Lu Y. Femtosecond laser rapid fabrication of large-area rose-like micropatterns on freestanding flexible graphene films. Sci Rep 2015; 5:17557. [PMID: 26615800 PMCID: PMC4663466 DOI: 10.1038/srep17557] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 11/02/2015] [Indexed: 11/09/2022] Open
Abstract
We developed a simple, scalable and high-throughput method for fabrication of large-area three-dimensional rose-like microflowers with controlled size, shape and density on graphene films by femtosecond laser micromachining. The novel biomimetic microflower that composed of numerous turnup graphene nanoflakes can be fabricated by only a single femtosecond laser pulse, which is efficient enough for large-area patterning. The graphene films were composed of layer-by-layer graphene nanosheets separated by nanogaps (~10-50 nm), and graphene monolayers with an interlayer spacing of ~0.37 nm constituted each of the graphene nanosheets. This unique hierarchical layering structure of graphene films provides great possibilities for generation of tensile stress during femtosecond laser ablation to roll up the nanoflakes, which contributes to the formation of microflowers. By a simple scanning technique, patterned surfaces with controllable densities of flower patterns were obtained, which can exhibit adhesive superhydrophobicity. More importantly, this technique enables fabrication of the large-area patterned surfaces at centimeter scales in a simple and efficient way. This study not only presents new insights of ultrafast laser processing of novel graphene-based materials but also shows great promise of designing new materials combined with ultrafast laser surface patterning for future applications in functional coatings, sensors, actuators and microfluidics.
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Affiliation(s)
- Xuesong Shi
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Xin Li
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Lan Jiang
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Liangti Qu
- Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry, Beijing Instituteof Technology, Beijing 100081, PR China
| | - Yang Zhao
- Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry, Beijing Instituteof Technology, Beijing 100081, PR China
| | - Peng Ran
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Qingsong Wang
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Qiang Cao
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Tianbao Ma
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, PR China
| | - Yongfeng Lu
- Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA
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Eigenfeld NT, Gertsch JC, Skidmore GD, George SM, Bright VM. Electrical and thermal conduction in ultra-thin freestanding atomic layer deposited W nanobridges. NANOSCALE 2015; 7:17923-17928. [PMID: 26463738 DOI: 10.1039/c5nr04885k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Work presented here measures and interprets the electrical and thermal conductivities of atomic layer deposited (ALD) free-standing single film and periodic tungsten and aluminum oxide nanobridges with thicknesses from ∼5-20 nm and ∼3-13 nm, respectively. Electrical conductivity of the W films is reduced by up to 99% from bulk, while thermal conductivity is reduced by up to 91%. Results indicate phonon contribution to thermal conductivity is dominant in these ALD films and may be substantially reduced by the incorporation of periodicity in the ALD W/Al2O3 nanolaminates. Additionally, thin film conduction modeling demonstrates nano-structured grain features largely dictate electron and phonon conduction in ALD W. New fabrication methods have allowed for the development of free-standing ultra-thin structures with layers on the order of several nanometers utilizing ALD. While the literature contains diverse studies of the physical properties of thin films prepared by traditional micro-fabrication sputtering or chemical vapor deposition techniques, there remains little data on freestanding structures containing ALD generated materials. Specifically, knowledge of the electrical and thermal conductivity of ALD generated materials will aid in the future development of ultra-thin nano-devices.
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Affiliation(s)
- Nathan T Eigenfeld
- Department of Mechanical Engineering, University of Colorado at Boulder, 1111 Engineering Drive, 427 UCB, Boulder, CO 80309-0427, USA.
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Peláez RJ, González-Mayorga A, Gutiérrez MC, García-Rama C, Afonso CN, Serrano MC. Tailored Fringed Platforms Produced by Laser Interference for Aligned Neural Cell Growth. Macromol Biosci 2015; 16:255-65. [DOI: 10.1002/mabi.201500253] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 09/06/2015] [Indexed: 01/26/2023]
Affiliation(s)
- Ramón J. Peláez
- Laser Processing Group, Instituto de Óptica, Consejo Superior de Investigaciones Científicas (CSIC); Calle Serrano 121; 28006-Madrid Spain
| | - Ankor González-Mayorga
- Laboratory of Neural Repair and Biomaterials, Hospital Nacional de Parapléjicos, Servicio de Salud de Castilla La Mancha; Finca La Peraleda s/n; 45071-Toledo Spain
| | - María C. Gutiérrez
- Group of Bioinspired Materials, Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas; Calle Sor Juana Inés de la Cruz 3; 28049-Madrid Spain
| | - Concepción García-Rama
- Laboratory of Neural Repair and Biomaterials, Hospital Nacional de Parapléjicos, Servicio de Salud de Castilla La Mancha; Finca La Peraleda s/n; 45071-Toledo Spain
| | - Carmen N. Afonso
- Laser Processing Group, Instituto de Óptica, Consejo Superior de Investigaciones Científicas (CSIC); Calle Serrano 121; 28006-Madrid Spain
| | - María C. Serrano
- Laboratory of Neural Repair and Biomaterials, Hospital Nacional de Parapléjicos, Servicio de Salud de Castilla La Mancha; Finca La Peraleda s/n; 45071-Toledo Spain
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Cagliani A, Lindvall N, Larsen MBBS, Mackenzie DMA, Jessen BS, Booth TJ, Bøggild P. Defect/oxygen assisted direct write technique for nanopatterning graphene. NANOSCALE 2015; 7:6271-6277. [PMID: 25779889 DOI: 10.1039/c4nr07585d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
High resolution nanopatterning of graphene enables manipulation of electronic, optical and sensing properties of graphene. In this work we present a straightforward technique that does not require any lithographic mask to etch nanopatterns into graphene. The technique relies on the damaged graphene to be etched selectively in an oxygen rich environment with respect to non-damaged graphene. Sub-40 nm features were etched into graphene by selectively exposing it to a 100 keV electron beam and then etching the damaged areas away in a conventional oven. Raman spectroscopy was used to evaluate the extent of damage induced by the electron beam as well as the effects of the selective oxidative etching on the remaining graphene.
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Affiliation(s)
- Alberto Cagliani
- DTU Nanotech-Center for Nanostructured Graphene, Technical University of Denmark, Building 345 East, DK-2800 Kgs. Lyngby, Denmark.
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