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Li H, Teal D, Liang Z, Kwon H, Huo D, Jin A, Fischer P, Fan DE. Precise electrokinetic position and three-dimensional orientation control of a nanowire bioprobe in solution. NATURE NANOTECHNOLOGY 2023; 18:1213-1221. [PMID: 37500771 DOI: 10.1038/s41565-023-01439-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 06/01/2023] [Indexed: 07/29/2023]
Abstract
Owing to Brownian-motion effects, the precise manipulation of individual micro- and nanoparticles in solution is challenging. Therefore, scanning-probe-based techniques, such as atomic force microscopy, attach particles to cantilevers to enable their use as nanoprobes. Here we demonstrate a versatile electrokinetic trap that simultaneously controls the two-dimensional position with a precision of 20 nm and 0.5° in the three-dimensional orientation of an untethered nanowire, as small as 300 nm in length, under an optical microscope. The method permits the active transport of nanowires with a speed-dependent accuracy reaching 90 nm at 2.7 μm s-1. It also allows for their synchronous three-dimensional alignment and rotation during translocation along complex trajectories. We use the electrokinetic trap to accurately move a nanoprobe and stably position it on the surface of a single bacterial cell for sensing secreted metabolites for extended periods. The precision-controlled manipulation underpins developing nanorobotic tools for assembly, micromanipulation and biological measurements with subcellular resolution.
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Affiliation(s)
- Huaizhi Li
- Materials Science and Engineering Program, Texas Materials Institute, University of Texas at Austin, Austin, TX, USA
| | - Daniel Teal
- Walker Department of Mechanical Engineering, University of Texas at Austin, Austin, TX, USA
| | - Zexi Liang
- Materials Science and Engineering Program, Texas Materials Institute, University of Texas at Austin, Austin, TX, USA
| | - Hyunah Kwon
- Institute for Molecular Systems Engineering and Advanced Materials, Heidelberg University, Heidelberg, Germany
- Max Planck Institute for Medical Research, Heidelberg, Germany
| | - David Huo
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, USA
| | - Alison Jin
- Chandra Family Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX, USA
| | - Peer Fischer
- Institute for Molecular Systems Engineering and Advanced Materials, Heidelberg University, Heidelberg, Germany
- Max Planck Institute for Medical Research, Heidelberg, Germany
| | - Donglei Emma Fan
- Materials Science and Engineering Program, Texas Materials Institute, University of Texas at Austin, Austin, TX, USA.
- Walker Department of Mechanical Engineering, University of Texas at Austin, Austin, TX, USA.
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Advances in droplet microfluidics for SERS and Raman analysis. Biosens Bioelectron 2022; 198:113822. [PMID: 34836710 DOI: 10.1016/j.bios.2021.113822] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 11/14/2021] [Accepted: 11/17/2021] [Indexed: 12/14/2022]
Abstract
Raman spectroscopy can realize qualitative and quantitative characterization, and surface-enhanced Raman spectroscopy (SERS) can further enhance its detection sensitivity. In combination with droplet microfluidics, some significant but insurmountable limitations of SERS and Raman spectroscopy can be overcome to some extent, thus improving their detection capability and extending their application. During the past decade, these systems have constantly developed and demonstrated a great potential in more applications, but there is no new review systematically summarizing the droplet microfluidics-based Raman and SERS analysis system since the first related review was published in 2011. Thus, there is a great need for a new review to summarize the advances. In this review, we focus on droplet microfluidics-based Raman and SERS analysis, and summarize two mainstream research directions on this topic up to now. The one is SERS or Raman detection in the moving droplet microreactors, including analysis of molecules, single cells and chemical reaction processes. The other one is SERS active microparticle fabrication via microfluidic droplet templates covering polymer matrix and photonic crystal microparticles. We also comment on the advantages, disadvantage and correlation resolution of droplet microfluidics for SERS or Raman. Finally, we summarize these systems and illustrate our perspectives for future research directions in this field.
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AAO Template-Assisted Fabrication of Ordered Ag Nanoparticles-Decorated Au Nanotubes Array for Surface-Enhanced Raman Scattering Detection. SUSTAINABILITY 2022. [DOI: 10.3390/su14031305] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Highly sensitive and reproducible surface-enhanced Raman scattering (SERS) substrates are the main challenge for practical applications. In this work, an ordered and hierarchical Ag nanoparticles (Ag-NPs)-decorated Au nanotubes (Au-NTs) array was achieved based on a funnel-shaped pore anodic aluminum oxide (AAO) template-assisted strategy. First, funnel-pore-AAO templates were fabricated by further oxidation of conical-pore-AAO templates achieved by multistep anodization and etching. Then physical sputtering was used to assemble the Au-NTs and Ag-NPs using the as-prepared funnel-pore-AAO as sacrificial templates. SEM revealed abundant sub-10 nm neighboring gaps and sub-10 nm nanocavities at the bottom of the nanotubes because of the special shape of the AAO template, which resulted in abundant strong “hot spots” contributing to the sensitive SERS detection. The resultant hierarchical substrates manifested a SERS enhancement factor of 1.8 × 107 and reproducible response to 10−11 M rhodamine 6G and 10−8 M methyl parathion, showing potential in SERS-based rapid detection of trace pollutants in the environment.
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Kong KV, Wu YC, Liu YC, Tsai SW, Chu KT, Chen HJ, Wu CY, Hsu YY, Hsieh CC, Liu WJ, Chiang MH. Demethylation of Artificial Hydrogenase Agent for Prolonged CO Release and Enhanced Anti-Tau Aggregation Activity. Chem Commun (Camb) 2022; 58:7245-7248. [DOI: 10.1039/d2cc02119f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbon Monoxide (CO) plays an important role in signaling in the cells, making its use as a therapeutic tool highly intriguing. Reduced burst emissions are important to avoid the cytotoxicity...
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Hsu KJ, Hsieh CL, Tsai CJ, Kong KV. Probing Molecular-Scale Oxidative Generation of Quinone Methides and Their Transformation Using Tip-Enhanced Raman Spectroscopy. J Phys Chem Lett 2021; 12:1110-1115. [PMID: 33475376 DOI: 10.1021/acs.jpclett.0c03313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Quinone methides (QMs) are very important intermediates in chemistry. These species are most often generated in situ with metal oxidants and transition metal complexes. Here, tip-enhanced Raman spectroscopy (TERS) has been implemented to investigate the in situ oxidative generation of a QM species from alkylphenols facilitated by a transition metal complex. Using TERS, the metal oxidant-mediated transformation of a phenol species has been observed. The subsequent oxidative addition reaction of QM has also been identified based on distinct vibrational features, which have been assigned based on density functional theory (DFT). This study may establish TERS as a chemical detection tool for various QM-mediated reactions.
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Affiliation(s)
- Keng-Jia Hsu
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Chang-Lin Hsieh
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Chi-Jui Tsai
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Kien Voon Kong
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
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Wallace GQ, Masson JF. From single cells to complex tissues in applications of surface-enhanced Raman scattering. Analyst 2020; 145:7162-7185. [DOI: 10.1039/d0an01274b] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
This tutorial review explores how three of the most common methods for introducing nanoparticles to single cells for surface-enhanced Raman scattering measurements can be adapted for experiments with complex tissues.
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Affiliation(s)
- Gregory Q. Wallace
- Département de Chimie
- Centre Québécois des Matériaux Fonctionnels (CQMF)
- and Regroupement Québécois des Matériaux de Pointe (RQMP)
- Université de Montréal
- Montréal
| | - Jean-François Masson
- Département de Chimie
- Centre Québécois des Matériaux Fonctionnels (CQMF)
- and Regroupement Québécois des Matériaux de Pointe (RQMP)
- Université de Montréal
- Montréal
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