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Teuber A, Caniglia G, Kranz C, Mizaikoff B. Graphene-enhanced quantum cascade laser infrared spectroscopy using diamond thin-film waveguides. Analyst 2023; 148:5144-5151. [PMID: 37702563 DOI: 10.1039/d3an00824j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/14/2023]
Abstract
Diamond thin-film waveguides were combined with quantum cascade lasers augmented by drop-casted graphene enabling surface-enhanced infrared absorption spectroscopy. Enhancing the signal provides access to an even more pronounced vibrational signature suitable for analytical scenarios where only a small sample volume and/or low analyte concentration levels are prevalent. To demonstrate the utility of this concept, taurine was investigated as a model analyte.
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Affiliation(s)
- Andrea Teuber
- Institute of Analytical and Bioanalytical Chemistry, University of Ulm, 89081 Ulm, Germany.
| | - Giada Caniglia
- Institute of Analytical and Bioanalytical Chemistry, University of Ulm, 89081 Ulm, Germany.
| | - Christine Kranz
- Institute of Analytical and Bioanalytical Chemistry, University of Ulm, 89081 Ulm, Germany.
| | - Boris Mizaikoff
- Institute of Analytical and Bioanalytical Chemistry, University of Ulm, 89081 Ulm, Germany.
- Hahn-Schickard, 89077 Ulm, Germany
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Nong J, Wei W, Lan G, Luo P, Guo C, Yi J, Tang L. Resolved Infrared Spectroscopy of Aqueous Molecules Employing Tunable Graphene Plasmons in an Otto Prism. Anal Chem 2020; 92:15370-15378. [PMID: 32957772 DOI: 10.1021/acs.analchem.0c02733] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Real-time and in situ detection of aqueous solution is essential for bioanalysis and chemical reactions. However, it is extremely challenging for infrared microscopic measurement because of the large background of water absorption. Here, we proposed a wideband-tunable graphene plasmonic infrared biosensor to detect biomolecules in an aqueous environment, employing attenuated total reflection in an Otto prism configuration and tightly confined plasmons in graphene nanoribbons. Benefiting from the graphene plasmonic electric field enhancement, such a biosensor is able to identify the molecular chemical fingerprints without the interference of water absorption. As a proof of concept, the recombinant protein AG and goat anti-mouse immunoglobulin G (IgG) are used as the sensing analytes, of which the vibrational modes (1669 and 1532 cm-1) are very close to the OH-bending mode of water (1640 cm-1). Simulation results show that the fingerprints of protein molecules in the water environment can be selectively enhanced. Therefore, the water absorption is successfully suppressed so that two protein modes can be resolved by sweeping graphene Fermi energy in a wide waveband. By further optimizing the incident angle and graphene mobility to improve the mode energy of graphene plasmons, maximum enhancement factors of 112 and 130 can be achieved for amide I and II bands. Our work provides an effective approach for the highly sensitive and selective in situ identification of aqueous-phase molecular fingerprints in fields of healthcare, food safety, and biochemical sensing.
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Affiliation(s)
- Jinpeng Nong
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, 400044 Chongqing, P. R. China.,Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, 400714 Chongqing, P. R. China
| | - Wei Wei
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, 400044 Chongqing, P. R. China.,Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, 400714 Chongqing, P. R. China
| | - Guilian Lan
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, 400044 Chongqing, P. R. China
| | - Peng Luo
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, 400044 Chongqing, P. R. China
| | - Caicheng Guo
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, 400044 Chongqing, P. R. China
| | - Juemin Yi
- Institut für Physik, Carl von Ossietzky Universität, D-26111 Oldenburg, Germany
| | - Linlong Tang
- Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, 400714 Chongqing, P. R. China
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Cao F, Wu L, Zhang X, Li S, Wang C, Zhen W, Jiang X. Dynamic surface properties of PEG-coated CuS nanoparticles alter their interaction with cells as revealed by surface-enhanced infrared spectroscopy. NANOSCALE ADVANCES 2019; 1:4268-4276. [PMID: 36134396 PMCID: PMC9417538 DOI: 10.1039/c9na00371a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 09/16/2019] [Indexed: 06/12/2023]
Abstract
Characterization of the dynamic changes of the basic surface properties of nanoparticles is of great significance to reveal the interaction mechanism between nanoparticles and cells; however, it is often neglected due to the limitations of existing analytical methods. This knowledge has been renewed by using surface enhanced infrared absorption spectroscopy (SEIRAS) to study the interaction between PEG-CuS nanoparticles and living cells attached to rGO-Au modified Au films. Based on the difference spectra of cell membranes and the associated water, we clearly revealed that Cu2+ ions produced by the degradation of PEG-CuS can coordinate with PEG, thus changing the interaction between nanoparticles and cells including how and how many nanoparticles enter the cells and the sequential photothermal effect, which breaks through the limitations of the present analytical methods.
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Affiliation(s)
- Fengjuan Cao
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Lie Wu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
| | - Xiaofei Zhang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
| | - Shanshan Li
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
| | - Chao Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
| | - Wenyao Zhen
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
| | - Xiue Jiang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science Changchun 130022 Jilin China
- University of Chinese Academy of Sciences Beijing 100049 China
- Department of Chemistry, University of Science and Technology of China Anhui 230026 China
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