1
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Haghniaz R, Gangrade A, Montazerian H, Zarei F, Ermis M, Li Z, Du Y, Khosravi S, de Barros NR, Mandal K, Rashad A, Zehtabi F, Li J, Dokmeci MR, Kim H, Khademhosseini A, Zhu Y. An All-In-One Transient Theranostic Platform for Intelligent Management of Hemorrhage. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2301406. [PMID: 37271889 PMCID: PMC10460878 DOI: 10.1002/advs.202301406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/24/2023] [Indexed: 06/06/2023]
Abstract
Developing theranostic devices to detect bleeding and effectively control hemorrhage in the prehospital setting is an unmet medical need. Herein, an all-in-one theranostic platform is presented, which is constructed by sandwiching silk fibroin (SF) between two silver nanowire (AgNW) based conductive electrodes to non-enzymatically diagnose local bleeding and stop the hemorrhage at the wound site. Taking advantage of the hemostatic property of natural SF, the device is composed of a shape-memory SF sponge, facilitating blood clotting, with ≈82% reduction in hemostatic time in vitro as compared with untreated blood. Furthermore, this sandwiched platform serves as a capacitive sensor that can detect bleeding and differentiate between blood and other body fluids (i.e., serum and water) via capacitance change. In addition, the AgNW electrode endows anti-infection efficiency against Escherichia coli and Staphylococcus aureus. Also, the device shows excellent biocompatibility and gradually biodegrades in vivo with no major local or systemic inflammatory responses. More importantly, the theranostic platform presents considerable hemostatic efficacy comparable with a commercial hemostat, Dengen, in rat liver bleeding models. The theranostic platform provides an unexplored strategy for the intelligent management of hemorrhage, with the potential to significantly improve patients' well-being through the integration of diagnostic and therapeutic capabilities.
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Affiliation(s)
| | - Ankit Gangrade
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
| | - Hossein Montazerian
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
- Department of BioengineeringUniversity of CaliforniaLos AngelesCA90095USA
- California NanoSystems InstituteUniversity of CaliforniaLos AngelesCA90095USA
| | - Fahimeh Zarei
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
| | - Menekse Ermis
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
| | - Zijie Li
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
- Mork Family Department of Chemical Engineering & Materials ScienceViterbi School of EngineeringUniversity of Southern CaliforniaLos AngelesCA90007USA
| | - Yuxuan Du
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
- Mork Family Department of Chemical Engineering & Materials ScienceViterbi School of EngineeringUniversity of Southern CaliforniaLos AngelesCA90007USA
| | - Safoora Khosravi
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
- Electrical and Computer Engineering DepartmentUniversity of British ColumbiaVancouverBCV6T 1Z4Canada
| | | | - Kalpana Mandal
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
| | - Ahmad Rashad
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
| | - Fatemeh Zehtabi
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
| | - Jinghang Li
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
| | | | - Han‐Jun Kim
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
- College of PharmacyKorea UniversitySejong30019Republic of Korea
| | | | - Yangzhi Zhu
- Terasaki Institute for Biomedical InnovationLos AngelesCA90064USA
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2
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Si X, Zhao H, Yi B, Zhou L, Ling Y, An Y, Wang Y, Lee HK, Tsung CK, Ma Y, Chou LY. An archetype of the electron-unobstructed core-shell composite with inherent selectivity: conductive metal-organic frameworks encapsulated with metal nanoparticles. NANOSCALE 2022; 14:9655-9660. [PMID: 35792823 DOI: 10.1039/d2nr02681c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The acquisition of monodisperse metal nanoparticles covered by conductive metal-organic frameworks (cMOFs) is an archetype of an electron-unobstructed core-shell composite, valued for its potential electrocatalytic ability and selectivity enhancement. In this work, Pt@cMOF composites with direct interfaces showed better performance in the oxygen reduction reaction than composites with indirect interfaces or with lower electroconductivity shells. This composite was proved to exhibit the ability to expedite electron transfer with different thicknesses of electrode materials. The detailed mechanism was studied by exploring the conductivity of shell materials, interfaces between cores and shells, and the surface electronic structure of the nanoparticles. We also report reaction selectivity from the inherent porous shells in the selective reduction of cinnamyl alcohol.
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Affiliation(s)
- Xiaomeng Si
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
| | - Haojie Zhao
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
| | - Beili Yi
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
| | - Li Zhou
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
| | - Yang Ling
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
| | - Yuanyuan An
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
| | - Yanli Wang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
| | - Hiang Kwee Lee
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
| | - Chia-Kuang Tsung
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA
| | - Yanhang Ma
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
- Shanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, China
| | - Lien-Yang Chou
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
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3
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Liang B, Xu D, Yu N, Xu Y, Ma X, Liu Q, Asif MS, Yan R, Liu M. Physics-Guided Neural-Network-Based Inverse Design of a Photonic -Plasmonic Nanodevice for Superfocusing. ACS APPLIED MATERIALS & INTERFACES 2022; 14:27397-27404. [PMID: 35649169 DOI: 10.1021/acsami.2c05083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Controlling the nanoscale light-matter interaction using superfocusing hybrid photonic-plasmonic devices has attracted significant research interest in tackling existing challenges, including converting efficiencies, working bandwidths, and manufacturing complexities. With the growth in demand for efficient photonic-plasmonic input-output interfaces to improve plasmonic device performances, sophisticated designs with multiple optimization parameters are required, which comes with an unaffordable computation cost. Machine learning methods can significantly reduce the cost of computations compared to numerical simulations, but the input-output dimension mismatch remains a challenging problem. Here, we introduce a physics-guided two-stage machine learning network that uses the improved coupled-mode theory for optical waveguides to guide the learning module and improve the accuracy of predictive engines to 98.5%. A near-unity coupling efficiency with symmetry-breaking selectivity is predicted by the inverse design. By fabricating photonic-plasmonic couplers using the predicted profiles, we demonstrate that the excitation efficiency of 83% on the radially polarized surface plasmon mode can be achieved, which paves the way for super-resolution optical imaging.
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Affiliation(s)
- Boqun Liang
- Materials Science and Engineering program, University of California─Riverside, Riverside, California 92521, United States
| | - Da Xu
- Department of Electrical and Computer Engineering, University of California─Riverside, Riverside, California 92521, United States
| | - Ning Yu
- Department of Chemical and Environmental Engineering, University of California─Riverside, Riverside, California 92521, United States
| | - Yaodong Xu
- Materials Science and Engineering program, University of California─Riverside, Riverside, California 92521, United States
| | - Xuezhi Ma
- Department of Electrical and Computer Engineering, University of California─Riverside, Riverside, California 92521, United States
| | - Qiushi Liu
- Department of Electrical and Computer Engineering, University of California─Riverside, Riverside, California 92521, United States
| | - M Salman Asif
- Department of Electrical and Computer Engineering, University of California─Riverside, Riverside, California 92521, United States
- Department of Computer Science and Engineering, University of California─Riverside, Riverside, California 92521, United States
| | - Ruoxue Yan
- Materials Science and Engineering program, University of California─Riverside, Riverside, California 92521, United States
- Department of Chemical and Environmental Engineering, University of California─Riverside, Riverside, California 92521, United States
| | - Ming Liu
- Materials Science and Engineering program, University of California─Riverside, Riverside, California 92521, United States
- Department of Electrical and Computer Engineering, University of California─Riverside, Riverside, California 92521, United States
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4
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Zhu Y, Li S, Li J, Falcone N, Cui Q, Shah S, Hartel MC, Yu N, Young P, de Barros NR, Wu Z, Haghniaz R, Ermis M, Wang C, Kang H, Lee J, Karamikamkar S, Ahadian S, Jucaud V, Dokmeci MR, Kim HJ, Khademhosseini A. Lab-on-a-Contact Lens: Recent Advances and Future Opportunities in Diagnostics and Therapeutics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2108389. [PMID: 35130584 PMCID: PMC9233032 DOI: 10.1002/adma.202108389] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 01/27/2022] [Indexed: 05/09/2023]
Abstract
The eye is one of the most complex organs in the human body, containing rich and critical physiological information (e.g., intraocular pressure, corneal temperature, and pH) as well as a library of metabolite biomarkers (e.g., glucose, proteins, and specific ions). Smart contact lenses (SCLs) can serve as a wearable intelligent ocular prosthetic device capable of noninvasive and continuous monitoring of various essential physical/biochemical parameters and drug loading/delivery for the treatment of ocular diseases. Advances in SCL technologies and the growing public interest in personalized health are accelerating SCL research more than ever before. Here, the current status and potential of SCL development through a comprehensive review from fabrication to applications to commercialization are discussed. First, the material, fabrication, and platform designs of the SCLs for the diagnostic and therapeutic applications are discussed. Then, the latest advances in diagnostic and therapeutic SCLs for clinical translation are reviewed. Later, the established techniques for wearable power transfer and wireless data transmission applied to current SCL devices are summarized. An outlook, future opportunities, and challenges for developing next-generation SCL devices are also provided. With the rise in interest of SCL development, this comprehensive and essential review can serve as a new paradigm for the SCL devices.
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Affiliation(s)
- Yangzhi Zhu
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Shaopei Li
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Jinghang Li
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
- School of Engineering, Westlake University, Hangzhou, Zhejiang Province, 310024, China
- School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, Hubei Province, 430205, China
| | - Natashya Falcone
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Qingyu Cui
- Department of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA, 90095, USA
| | - Shilp Shah
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
- Department of Bioengineering, University of California-Los Angeles, Los Angeles, CA, 90095, USA
| | - Martin C Hartel
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
- Department of Bioengineering, University of California-Los Angeles, Los Angeles, CA, 90095, USA
| | - Ning Yu
- Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA, 92521, USA
| | - Patric Young
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | | | - Zhuohong Wu
- Department of Nanoengineering, University of California-San Diego, San Diego, CA, 92093, USA
| | - Reihaneh Haghniaz
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Menekse Ermis
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Canran Wang
- Andrew and Peggy Cherng Department of Medical Engineering, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Heemin Kang
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Junmin Lee
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | | | - Samad Ahadian
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Vadim Jucaud
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Mehmet R Dokmeci
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Han-Jun Kim
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
| | - Ali Khademhosseini
- Terasaki Institute for Biomedical Innovation, Los Angeles, CA, 90064, USA
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5
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Pienpinijtham P, Kitahama Y, Ozaki Y. Progress of tip-enhanced Raman scattering for the last two decades and its challenges in very recent years. NANOSCALE 2022; 14:5265-5288. [PMID: 35332899 DOI: 10.1039/d2nr00274d] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Tip-enhanced Raman scattering (TERS) has recently attracted remarkable attention as a novel nano-spectroscopy technique. TERS, which provides site-specific information, can be performed on any material surface regardless of morphology. Moreover, it can be applied in various environments, such as ambient air, ultrahigh vacuum (UHV), solutions, and electrochemical environments. This review reports on one hand progress of TERS for the last two decades, and on the other hand, its challenges in very recent years. Part of the progress of TERS starts with the prehistory and history of TERS, and then, the characteristics and advantages of TERS are described. Significant emphasis is put on the development of TERS instrumentation and equipment such as ultrahigh vacuum TERS, liquid TERS, electrochemical-TERS, and tip-preparations. Applications of TERS, particularly those with nanocarbons, biological materials, and surface and interface analysis, are mentioned in some detail. In the part on challenges, we focus on the very recent advances in TERS; progress in spatial resolution to the angstrom scale is the hottest topic. Recent TERS studies performed under UHV, for example chemical imaging at the angstrom scale and Raman detection of bond breaking and making of a chemisorbed up-standing single molecules at single-bond level, are reviewed. Of course, there is no clear border between the two parts. In the last part the perspective of TERS is discussed.
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Affiliation(s)
- Prompong Pienpinijtham
- Sensor Research Unit (SRU), Department of Chemistry, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand.
- National Nanotechnology Center of Advanced Structural and Functional Nanomaterials, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
- Center of Excellence in Bioactive Resources for Innovative Clinical Applications, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
| | - Yasutaka Kitahama
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan.
| | - Yukihiro Ozaki
- School of Biological and Environmental Sciences, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan.
- Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan
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6
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Zhu Y, Hartel MC, Yu N, Garrido PR, Kim S, Lee J, Bandaru P, Guan S, Lin H, Emaminejad S, de Barros NR, Ahadian S, Kim HJ, Sun W, Jucaud V, Dokmeci MR, Weiss PS, Yan R, Khademhosseini A. Epidermis-Inspired Wearable Piezoresistive Pressure Sensors Using Reduced Graphene Oxide Self-Wrapped Copper Nanowire Networks. SMALL METHODS 2022; 6:e2100900. [PMID: 35041280 PMCID: PMC8852346 DOI: 10.1002/smtd.202100900] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 10/29/2021] [Indexed: 06/14/2023]
Abstract
Wearable piezoresistive sensors are being developed as electronic skins (E-skin) for broad applications in human physiological monitoring and soft robotics. Tactile sensors with sufficient sensitivities, durability, and large dynamic ranges are required to replicate this critical component of the somatosensory system. Multiple micro/nanostructures, materials, and sensing modalities have been reported to address this need. However, a trade-off arises between device performance and device complexity. Inspired by the microstructure of the spinosum at the dermo epidermal junction in skin, a low-cost, scalable, and high-performance piezoresistive sensor is developed with high sensitivity (0.144 kPa-1 ), extensive sensing range ( 0.1-15 kPa), fast response time (less than 150 ms), and excellent long-term stability (over 1000 cycles). Furthermore, the piezoresistive functionality of the device is realized via a flexible transparent electrode (FTE) using a highly stable reduced graphene oxide self-wrapped copper nanowire network. The developed nanowire-based spinosum microstructured FTEs are amenable to wearable electronics applications.
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Affiliation(s)
- Yangzhi Zhu
- Corresponding Authors: (Y. Zhu); (R. Yan); (A. Khademhosseini)
| | | | - Ning Yu
- Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, Riverside, California 92521, United States
| | - Pamela Rosario Garrido
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States; Department of Electric and Electronic Engineering, Technological Institute of Merida, Merida, Yucatan 97118, Mexico
| | - Sanggon Kim
- Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, Riverside, California 92521, United States
| | - Junmin Lee
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Praveen Bandaru
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Shenghan Guan
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Haisong Lin
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States; Department of Biomedical Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Sam Emaminejad
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States; Department of Biomedical Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | | | - Samad Ahadian
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Han-Jun Kim
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Wujin Sun
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Vadim Jucaud
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Mehmet R. Dokmeci
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90064, United States
| | - Paul S. Weiss
- Department of Biomedical Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States; Department of Chemistry & Biochemistry, Department of Materials Science & Engineering, and California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Ruoxue Yan
- Corresponding Authors: (Y. Zhu); (R. Yan); (A. Khademhosseini)
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7
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Recommended implementation of electrical resistance tomography for conductivity mapping of metallic nanowire networks using voltage excitation. Sci Rep 2021; 11:13167. [PMID: 34162910 PMCID: PMC8222310 DOI: 10.1038/s41598-021-92208-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 06/04/2021] [Indexed: 11/23/2022] Open
Abstract
The knowledge of the spatial distribution of the electrical conductivity of metallic nanowire networks (NWN) is important for tailoring the performance in applications. This work focuses on Electrical Resistance Tomography (ERT), a technique that maps the electrical conductivity of a sample from several resistance measurements performed on its border. We show that ERT can be successfully employed for NWN characterisation if a dedicated measurement protocol is employed. When applied to other materials, ERT measurements are typically performed with a constant current excitation; we show that, because of the peculiar microscopic structure and behaviour of metallic NWN, a constant voltage excitation protocols is preferable. This protocol maximises the signal to noise ratio in the resistance measurements—and thus the accuracy of ERT maps—while preventing the onset of sample alterations.
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8
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Zhang K, Bao Y, Cao M, Taniguchi SI, Watanabe M, Kambayashi T, Okamoto T, Haraguchi M, Wang X, Kobayashi K, Yamada H, Ren B, Tachizaki T. Low-Background Tip-Enhanced Raman Spectroscopy Enabled by a Plasmon Thin-Film Waveguide Probe. Anal Chem 2021; 93:7699-7706. [PMID: 34014089 DOI: 10.1021/acs.analchem.1c00806] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tip-enhanced Raman spectroscopy (TERS) is a nano-optical approach to extract spatially resolved chemical information with nanometer precision. However, in the case of direct-illumination TERS, which is often employed in commercial TERS instruments, strong fluorescence or far-field Raman signals from the illuminated areas may be excited as a background. They may overwhelm the near-field TERS signal and dramatically decrease the near-field to far-field signal contrast of TERS spectra. It is still challenging for TERS to study the surface of fluorescent materials or a bulk sample that cannot be placed on an Au/Ag substrate. In this study, we developed an indirect-illumination TERS probe that allows a laser to be focused on a flat interface of a thin-film waveguide located far away from the region generating the TERS signal. Surface plasmon polaritons are generated stably on the waveguide and eventually accumulated at the tip apex, thereby producing a spatially and energetically confined hotspot to ensure stable and high-resolution TERS measurements with a low background. With this thin-film waveguide probe, TERS spectra with obvious contrast from a diamond plate can be acquired. Furthermore, the TERS technique based on this probe exhibits excellent TERS signal stability, a long lifetime, and good spatial resolution. This technique is expected to have commercial potential and enable further popularization and development of TERS technology as a powerful analytical method.
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Affiliation(s)
- Kaifeng Zhang
- Research & Development Group, Hitachi, Ltd., Yokohama 244-0817, Kanagawa, Japan.,Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yifan Bao
- State Key Laboratory of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Maofeng Cao
- State Key Laboratory of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Shin-Ichi Taniguchi
- Research & Development Group, Hitachi, Ltd., Yokohama 244-0817, Kanagawa, Japan
| | - Masahiro Watanabe
- Research & Development Group, Hitachi, Ltd., Yokohama 244-0817, Kanagawa, Japan
| | - Takuya Kambayashi
- Research & Development Group, Hitachi, Ltd., Yokohama 244-0817, Kanagawa, Japan
| | - Toshihiro Okamoto
- Department of Optical Science and Technology, Faculty of Engineering, Tokushima University, Tokushima 770-8501, Japan
| | - Masanobu Haraguchi
- Department of Optical Science and Technology, Faculty of Engineering, Tokushima University, Tokushima 770-8501, Japan
| | - Xiang Wang
- State Key Laboratory of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Kei Kobayashi
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hirofumi Yamada
- Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Bin Ren
- State Key Laboratory of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Takehiro Tachizaki
- School of Engineering, Tokai University, Hiratsuka 259-1292, Kanagawa, Japan
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9
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Kato R, Taguchi K, Yadav R, Umakoshi T, Verma P. One-side metal-coated pyramidal cantilever tips for highly reproducible tip-enhanced Raman spectroscopy. NANOTECHNOLOGY 2020; 31:335207. [PMID: 32375128 DOI: 10.1088/1361-6528/ab90b6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Tip-enhanced Raman spectroscopy (TERS) has been recognized as a useful tool for nanoscale chemical analysis, and it can further reach down to the sub-nanometer scale in the gap-mode configuration. Using an atomic force microscopy (AFM) in gap-mode TERS for position control of a metallic tip, a unique and correlative analysis can be even realized at the single molecule level. However, one of crucial issues in AFM-based gap-mode TERS is the fabrication of reliable and reproducible cantilver metallic tips. Here, we propose a simple, cost-effective fabrication method of metal-coated tips for AFM-based gap-mode TERS by means of the physical vapor deposition technique in a reproducible way. Our plamonic tips have extremely smooth silver layers on one side of the pyramidal tip, which is totally different from the regular metallic tips that hold granular metallic structures randomly arranged on their bodies. Importantly, all fabricated tips exhibited a reasonably high enhancement factor of more than 104, which indicates that the reproducibility of our plasmonic tip is virtually 100% in the gap-mode configuration. The excellent reproducibility of gap-mode TERS measurement holds great promise for rendering AFM-based TERS as a powerful analytical technique in a broad range of fields.
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Affiliation(s)
- Ryo Kato
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
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