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Hong Q, Zhu W, Wang S, Jiang L, He J, Zhan J, Li X, Zhao X, Zhao B. High-Resolution Femtosecond Laser-Induced Carbon and Ag Hybrid Structure for Bend Sensing. ACS OMEGA 2022; 7:42256-42263. [PMID: 36440162 PMCID: PMC9685746 DOI: 10.1021/acsomega.2c05060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
Miniaturized resistance-based portable bending sensors have been widely used for human health monitoring in recent years. Their sensitivities are defined by their resistance variations (ΔR/R), which strongly rely on the conductivity and minimum line width of the sensing unit. Laser-induced carbonization is a fast and simple method to fabricate porous-sensing structures. However, the fabrication resolution of conductive and deformation-sensitive structures is limited by the thermal effect of commonly used laser sources. With the assistance of femtosecond laser temporal shaping, plasma ejection confinement, and silver nitrate doping, the sheet resistance of the sensing structure was improved from 15 to 0.0004 Ω/□. A thin line with a lateral resolution of 6.5 μm is fabricated as the sensing unit. The fFabricated structures are characterized by electron microscopy, Raman spectroscopy, energy-dispersive spectroscopy, X-ray scattering, and time-resolved images. The strain sensor demonstrates a ΔR/R of 25.8% with a rising edge of 109 ms in the cyclic bending test. The sensor is further applied for detecting human pulse and finger bending.
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Affiliation(s)
- Quan Hong
- Laser
Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, P. R. China
| | - Weihua Zhu
- Laser
Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, P. R. China
| | - Sumei Wang
- Laser
Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, P. R. China
- Yangtze
Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China
| | - Lan Jiang
- Laser
Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, P. R. China
- Beijing
Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
| | - Jiahua He
- Laser
Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, P. R. China
| | - Jie Zhan
- Laser
Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, P. R. China
| | - Xin Li
- Laser
Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, P. R. China
- Beijing
Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
| | - Xiaoming Zhao
- Tianjin
Navigation Instruments Research Institute, No. 268 Dingzigu No. 1 Street,
Hong Qiao District, Tianjin 300131, China
| | - Bingquan Zhao
- Tianjin
Navigation Instruments Research Institute, No. 268 Dingzigu No. 1 Street,
Hong Qiao District, Tianjin 300131, China
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Copper Electroless Metallization of Cellulose Paper via Polydopamine Coating and Silver Catalyst. MATERIALS 2021; 14:ma14226862. [PMID: 34832264 PMCID: PMC8623923 DOI: 10.3390/ma14226862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/11/2021] [Accepted: 11/12/2021] [Indexed: 11/29/2022]
Abstract
The paper presents the results of copper electroless metallization of cellulose paper with the use of a polydopamine coating and silver catalyst. The polydopamine coating was deposited via a simple dip method using a dopamine hydrochloride solution in 10 mM TRIS-HCl buffer with a pH of 8.5. The research showed that as a result of this process, cellulose fibers were covered with a homogeneous layer of polydopamine. The unique properties of the polydopamine coating allowed the reduction of silver ions from silver nitrate solution and the deposition of silver atoms on the paper surface. Deposited silver served as a catalyst in the autocatalytic electroless copper-plating process. The copper layer covered the entire surface of the paper sheet after 5 min of metallization, favorably affecting the electrical properties of this material by lowering the surface resistivity. The deposited copper layer was further characterized by good adhesive strength and high susceptibility to deformation.
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