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Song Y, Sun M, Wu H, Zhao W, Wang Q. Temperature Sensor Based on Surface Plasmon Resonance with TiO 2-Au-TiO 2 Triple Structure. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7766. [PMID: 36363358 PMCID: PMC9653889 DOI: 10.3390/ma15217766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/01/2022] [Accepted: 11/01/2022] [Indexed: 06/16/2023]
Abstract
Temperature sensors have been widely applied in daily life and production, but little attention has been paid to the research on temperature sensors based on surface plasmon resonance (SPR) sensors. Therefore, an SPR temperature sensor with a triple structure of titanium dioxide (TiO2) film, gold (Au) film, and TiO2 nanorods is proposed in this article. By optimizing the thickness and structure of TiO2 film and nanorods and Au film, it is found that the sensitivity of the SPR temperature sensor can achieve 6038.53 nm/RIU and the detection temperature sensitivity is -2.40 nm/°C. According to the results, the sensitivity of the optimized sensor is 77.81% higher than that of the sensor with pure Au film, which is attributed to the TiO2(film)-Au-TiO2(nanorods) structure. Moreover, there is a good linear correlation (greater than 0.99) between temperature and resonance wavelength in the range from 0 °C to 60 °C, which can ensure the detection resolution. The high sensitivity, FOM, and detection resolution indicate that the proposed SPR sensor has a promising application in temperature monitoring.
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Affiliation(s)
- Yutong Song
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Meng Sun
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Haoyu Wu
- College of Sciences, Northeastern University, Shenyang 110819, China
| | - Wanli Zhao
- Science and Technology on Electro-Optical Information Security Control Laboratory, Tianjin 300308, China
| | - Qi Wang
- College of Sciences, Northeastern University, Shenyang 110819, China
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Lin Y, Zhang J, Zhang Y, Yan S, Nan F, Yu Y. Multi-Effect Enhanced Raman Scattering Based on Au/ZnO Nanorods Structures. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3785. [PMID: 36364559 PMCID: PMC9655003 DOI: 10.3390/nano12213785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 10/19/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
Surface-enhanced Raman scattering (SERS) was considered a potential spectroscopic technique for applications of molecular detection and has drawn great research interest during the past decade. So far, fabrications of cost-effective SERS substrates with high sensitivity and stability and the corresponding enhanced mechanisms are always among the list of research topics, although great progress has been made. In this work, Au particles were decorated on Si, ZnO film and ZnO nanorod arrays simultaneously by an economical method of ion sputtering, generating three kinds of SERS substrates for R6G detection. The morphology difference of Au particles on different samples and the consequent influence on Raman scattering were studied. The experiment results exhibited that substrates with Au particles decorated on ZnO nanorods had the highest Raman enhancement factor. Furthermore, multi-effect enhanced mechanisms summarized as localized surface plasmon resonance (LSPR) filed coupling, electron transferring induced by LSPR of Au particles and whispering gallery mode (WGM) effect of the ZnO cavity were presented. This work provides a convenient and efficient method of fabricating SERS substrates and indicates that such proper metal/semiconductor composite structures are promising candidates for SERS applications.
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Wu HY, Lin HC, Liu YH, Chen KL, Wang YH, Sun YS, Hsu JC. Highly Sensitive, Robust, and Recyclable TiO 2/AgNP Substrate for SERS Detection. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27196755. [PMID: 36235289 PMCID: PMC9571145 DOI: 10.3390/molecules27196755] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 10/05/2022] [Accepted: 10/07/2022] [Indexed: 11/26/2022]
Abstract
Label-free biosensors provide an important platform for detecting chemical and biological substances without needing extra labeling agents. Unlike surface-based techniques such as surface plasmon resonance (SPR), interference, and ellipsometry, surface-enhanced Raman spectroscopy (SERS) possesses the advantage of monitoring analytes both on surfaces and in solutions. Increasing the SERS enhancement is crucial to preparing high-quality substrates without quickly losing their stability, sensitivity, and repeatability. However, fabrication methods based on wet chemistry, nanoimprint lithography, spark discharge, and laser ablation have drawbacks of waste of time, complicated processes, or nonreproducibility in surface topography. This study reports the preparation of recyclable TiO2/Ag nanoparticle (AgNP) substrates by using simple arc ion plating and direct-current (dc) magnetron sputtering technologies. The deposited anatase-phased TiO2 ensured the photocatalytic degradation of analytes. By measuring the Raman spectra of rhodamine 6G (R6G) in titrated concentrations, a limit of detection (LOD) of 10−8 M and a SERS enhancement factor (EF) of 1.01 × 109 were attained. Self-cleaning was performed via UV irradiation, and recyclability was achieved after at least five cycles of detection and degradation. The proposed TiO2/AgNP substrates have the potential to serve as eco-friendly SERS enhancers for label-free detection of various chemical and biological substances.
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Affiliation(s)
- Hsing-Yu Wu
- System Manufacturing Center, National Chung-Shan Institute of Science and Technology, New Taipei City 237209, Taiwan
- Center for Astronomical Physics and Engineering, Department of Optics and Photonics, National Central University, Taoyuan City 320317, Taiwan
- Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Hung-Chun Lin
- Department of Physics, Fu Jen Catholic University, New Taipei City 242062, Taiwan
| | - Yung-Hsien Liu
- System Manufacturing Center, National Chung-Shan Institute of Science and Technology, New Taipei City 237209, Taiwan
- Department of Chemical and Materials Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan City 335009, Taiwan
| | - Kai-Lin Chen
- System Manufacturing Center, National Chung-Shan Institute of Science and Technology, New Taipei City 237209, Taiwan
| | - Yu-Hsun Wang
- Department of Physics, Fu Jen Catholic University, New Taipei City 242062, Taiwan
| | - Yung-Shin Sun
- Department of Physics, Fu Jen Catholic University, New Taipei City 242062, Taiwan
- Correspondence: (Y.-S.S.); (J.-C.H.)
| | - Jin-Cherng Hsu
- Department of Physics, Fu Jen Catholic University, New Taipei City 242062, Taiwan
- Graduate Institute of Applied Science and Engineering, Fu Jen Catholic University, New Taipei City 242062, Taiwan
- Correspondence: (Y.-S.S.); (J.-C.H.)
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