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Li X, Petrescu FIT, Danzeng Q, Zhu H, Li Y, Shi G. A Bioinspired Ag Nanoparticle/PPy Nanobowl/TiO 2 Micropyramid SERS Substrate. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4104. [PMID: 36432388 PMCID: PMC9698954 DOI: 10.3390/nano12224104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/07/2022] [Accepted: 11/21/2022] [Indexed: 06/16/2023]
Abstract
In this paper, the micropyramid structure was transferred to the TiO2 substrate by soft imprinting. Then, the PPy nanobowls were assembled onto the surface of the TiO2 micropyramids through the induction of the PS template. Finally, a layer of Ag nanoparticles was deposited on the surface of PPy nanobowls to form a novel Ag nanoparticle/PPy nanobowl/TiO2 micropyramid SERS substrate. Its structure is similar to the bioinspired compound eyes. This substrate exhibited excellent antireflection, ultra-sensitivity, excellent uniformity, and recyclability. The concentration of R6G molecules can be detected as low as 10-9 mol/L, and the Raman enhancement factor can reach 3.4 × 105. In addition, the excellent catalytic degradation performance of the substrate ensures recyclability. This work proves that the micropyramid structure can be applied to other SERS materials besides silicon by the above methods, which broadens the selection range of composite SERS materials.
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Affiliation(s)
- Xin Li
- Key Laboratory of Synthetic and Biotechnology Colloids, Ministry of Education; School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | | | - Qupei Danzeng
- Department of Tibetan medicine; University of Tibetan Medicine, Lhasa 540100, China
| | - Haiyan Zhu
- Key Laboratory of Synthetic and Biotechnology Colloids, Ministry of Education; School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Ying Li
- Key Laboratory of Synthetic and Biotechnology Colloids, Ministry of Education; School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Gang Shi
- Key Laboratory of Synthetic and Biotechnology Colloids, Ministry of Education; School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
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A Simple Polypyrrole/Polyvinylidene Fluoride Membrane with Hydrophobic and Self-Floating Ability for Solar Water Evaporation. NANOMATERIALS 2022; 12:nano12050859. [PMID: 35269347 PMCID: PMC8912860 DOI: 10.3390/nano12050859] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 03/01/2022] [Accepted: 03/01/2022] [Indexed: 12/04/2022]
Abstract
The traditional hydrophobic solarevaporator is generally obtained through the modification of alkyl or fluoroalkyl on the photothermal membrane. However, the modified groups can easily be oxidized in the long-term use process, resulting in the poor salt resistance and stability of photothermal membrane. In order to solve this problem, a simple polypyrrole/polyvinylidene fluoride membrane, consisting of an intrinsic hydrophobic support (polyvinylidene fluoride) and a photothermal material (polypyrrole), was fabricated by ultrasonically mixing and immersed precipitation. This photothermal membrane showed good self-floating ability in the process of water evaporation. In order to further improve the photothermal conversion efficiency, a micropyramid structure with antireflective ability was formed on the surface of membrane by template method. The micropyramids can enhance the absorption efficiency of incident light. The water evaporation rate reached 1.42 kg m−2 h−1 under 1 sun irradiation, and the photothermal conversion efficiency was 88.7%. The hydrophobic polyvinylidene fluoride ensures that NaCl cannot enter into membrane during the evaporation process of the brine, thus realizing the stability and salt resistance of polypyrrole/polyvinylidene fluoride in 3.5%wt and 10%wt NaCl solution.
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Jin X, Zhu Q, Feng L, Li X, Zhu H, Miao H, Zeng Z, Wang Y, Li Y, Wang L, Liu X, Shi G. Light-Trapping SERS Substrate with Regular Bioinspired Arrays for Detecting Trace Dyes. ACS APPLIED MATERIALS & INTERFACES 2021; 13:11535-11542. [PMID: 33625204 DOI: 10.1021/acsami.1c00702] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Recently, few studies have focused on the light-trapping surface-enhanced Raman scattering (SERS) substrate combined with Si micropyramids and Ag (or Au). However, the Si micropyramids possess no ordered period, which not only affects the repeatability of the SERS signal but also affects the theoretical exploration. Here, the ordered micropyramids with strong light-trapping capability were fabricated by utilizing unconventional nanosphere lithography and anisotropy wet etching technique. Then, the Ag nanobowls were assembled on the ordered micropyramids to form the SERS substrate with bioinspired compound-eyes structure by utilizing the liquid-solid interface self-assembly and transfer technique. Especially, the evidence for the contribution of antireflective Si micropyramids to Raman enhancement was first presented. For this bioinspired SERS substrate, the lowest concentration of R6G that can be detected is 10-13 M with the level of a single molecule, and the relative standard deviation (RSD) is 3.68%. Meanwhile, the quantitative analysis and qualitative analysis can be realized. Especially, simultaneous trace detection of four common dyes (R6G, CV, MG, and MB) in food can be realized, suggesting that this SERS substrate will have a good application prospect in the field of optical sensors.
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Affiliation(s)
- Xuan Jin
- The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Qunyan Zhu
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Lei Feng
- National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences and Collaborative, Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Xin Li
- The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Haiyan Zhu
- The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Hongyan Miao
- The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Zhoufang Zeng
- Research and Development Center for Genetics Resource, Chinese Academy of Sciences, Changzhou 213000, China
| | - Yandong Wang
- Research and Development Center for Genetics Resource, Chinese Academy of Sciences, Changzhou 213000, China
| | - Ying Li
- The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Likui Wang
- The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Xuefeng Liu
- The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Gang Shi
- The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
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Dou S, Xu H, Zhao J, Zhang K, Li N, Lin Y, Pan L, Li Y. Bioinspired Microstructured Materials for Optical and Thermal Regulation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2000697. [PMID: 32686250 DOI: 10.1002/adma.202000697] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 04/28/2020] [Indexed: 06/11/2023]
Abstract
Precise optical and thermal regulatory systems are found in nature, specifically in the microstructures on organisms' surfaces. In fact, the interaction between light and matter through these microstructures is of great significance to the evolution and survival of organisms. Furthermore, the optical regulation by these biological microstructures is engineered owing to natural selection. Herein, the role that microstructures play in enhancing optical performance or creating new optical properties in nature is summarized, with a focus on the regulation mechanisms of the solar and infrared spectra emanating from the microstructures and their role in the field of thermal radiation. The causes of the unique optical phenomena are discussed, focusing on prevailing characteristics such as high absorption, high transmission, adjustable reflection, adjustable absorption, and dynamic infrared radiative design. On this basis, the comprehensive control performance of light and heat integrated by this bioinspired microstructure is introduced in detail and a solution strategy for the development of low-energy, environmentally friendly, intelligent thermal control instruments is discussed. In order to develop such an instrument, a microstructural design foundation is provided.
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Affiliation(s)
- Shuliang Dou
- National Key Laboratory of Science and Technology on Advanced Composites, Harbin Institute of Technology, Harbin, 150006, China
| | - Hongbo Xu
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Jiupeng Zhao
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Ke Zhang
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Na Li
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Yipeng Lin
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Lei Pan
- National Key Laboratory of Science and Technology on Advanced Composites, Harbin Institute of Technology, Harbin, 150006, China
| | - Yao Li
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
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Liu S, Tso CY, Lee HH, Zhang Y, Yu KM, Chao CYH. Bio-inspired TiO 2 nano-cone antireflection layer for the optical performance improvement of VO 2 thermochromic smart windows. Sci Rep 2020; 10:11376. [PMID: 32647345 PMCID: PMC7347835 DOI: 10.1038/s41598-020-68411-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 06/24/2020] [Indexed: 11/10/2022] Open
Abstract
Vanadium dioxide (VO2) is a promising material for thermochromic glazing. However, VO2 thermochromic smart windows suffer from several problems that prevent commercialization: low luminous transmittance (Tlum) and low solar modulation ability (ΔTsol). The solution to these problems can be sought from nature where the evolution of various species has enabled them to survive. Investigations into the morphology of moths eyes has shown that their unique nanostructures provide an excellent antireflection optical layer that helps moths sharply capture the light in each wavelength from a wide angle. Inspired by this mechanism, a VO2 thermochromic smart window coated with a TiO2 antireflection layer with a novel nano-cone structure, is presented in this study to achieve high Tlum and ΔTsol. Optimization for the key structure parameters is summarized based on the FDTD numerical simulations. The optimized structure exhibits a Tlum of 55.4% with ΔTsol of 11.3%, an improvement of about 39% and 72% respectively compared to the VO2 window without an antireflection layer. Furthermore, wide-angle antireflection and polarization independence are also demonstrated by this nano-cone coating. This work provides an alternative method to enhance the optical performance of VO2 smart windows.
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Affiliation(s)
- Sai Liu
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Chi Yan Tso
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
| | - Hau Him Lee
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Yi Zhang
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| | - Kin Man Yu
- Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Christopher Y H Chao
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
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