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Tseng SC, Yu CC, Lin DC, Tseng YC, Chen HL, Chen YC, Chou SY, Wang LA. Laser-induced jets of nanoparticles: exploiting air drag forces to select the particle size of nanoparticle arrays. NANOSCALE 2013; 5:2421-2428. [PMID: 23400221 DOI: 10.1039/c3nr33835e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this study, we developed a new method-based on laser-induced jets of nanoparticles (NPs) and air drag forces-to select the particle size of NP arrays. First, the incident wavelength of an excimer laser was varied to ensure good photo-to-thermal energy conversion efficiency. We then exploited air drag forces to select NPs with sizes ranging from 5 to 50 nm at different captured distances. Controlling the jet distances allowed us to finely tune the localized surface plasmon resonance (LSPR) wavelength. The shifting range of the LSPR wavelengths of the corresponding NP arrays prepared using the laser-induced jet was wider than that of a single NP or an NP dimer. We further calculated the relationship between the air drag force and the diameter of the NPs to provide good control over the mean NP size (capture size ≧ 300 μm) by varying the capture distance. Laser-induced jets of NPs could also be used to fabricate NP arrays on a variety of substrates, including Si, glass, plastic, and paper. This method has the attractive features of rapid, large-area preparation in an ambient environment, no need for further thermal annealing treatment, ready control over mean particle size, and high selectivity in the positioning of NP arrays. Finally, we used this method to prepare large NP arrays for acting hot spots on surface-enhanced Raman scattering-active substrates, and 10(-12) M R6G can be detected. Besides, we also prepare small NP arrays to act as metal catalysts for constructing low-reflection, broadband light trapping nanostructures on Si substrates.
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Affiliation(s)
- Shao-Chin Tseng
- Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
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Zheng J, Jiao A, Yang R, Li H, Li J, Shi M, Ma C, Jiang Y, Deng L, Tan W. Fabricating a reversible and regenerable Raman-active substrate with a biomolecule-controlled DNA nanomachine. J Am Chem Soc 2012; 134:19957-60. [PMID: 23190376 PMCID: PMC3568521 DOI: 10.1021/ja308875r] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A DNA configuration switch is designed to fabricate a reversible and regenerable Raman-active substrate. The substrate is composed of a Au film and a hairpin-shaped DNA strand (hot-spot-generation probes, HSGPs) labeled with dye-functionalized silver nanoparticles (AgNPs). Another ssDNA that recognizes a specific trigger is used as an antenna. The HSGPs are immobilized on the Au film to draw the dye-functionalized AgNPs close to the Au surface and create an intense electromagnetic field. Hybridization of HSGP with the two arm segments of the antenna forms a triplex-stem structure to separate the dye-functionalized AgNPs from the Au surface, quenching the Raman signal. Interaction with its trigger releases the antenna from the triplex-stem structure, and the hairpin structure of the HSGP is restored, creating an effective "off-on" Raman signal switch. Nucleic acid sequences associated with the HIV-1 U5 long terminal repeat sequences and ATP are used as the triggers. The substrate shows excellent reversibility, reproducibility, and controllability of surface-enhanced Raman scattering (SERS) effects, which are significant requirements for practical SERS sensor applications.
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Affiliation(s)
- Jing Zheng
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
| | - Anli Jiao
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
| | - Ronghua Yang
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
| | - Huimin Li
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
| | - Jishan Li
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
| | - Muling Shi
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
| | - Cheng Ma
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
| | - Ying Jiang
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
| | - Li Deng
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
| | - Weihong Tan
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha, 410082, China
- Center for Research at the Bio/Nano Interface, Department of Chemistry and Department of Physiology and Functional Genomics, University of Florida, Gainesville, Florida, 32611-7200, USA
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Kho KW, Dinish US, Kumar A, Olivo M. Frequency shifts in SERS for biosensing. ACS NANO 2012; 6:4892-902. [PMID: 22642375 DOI: 10.1021/nn300352b] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report an observation of a peculiar effect in which the vibrational frequencies of antibody-conjugated SERS-active reporter molecules are shifted in quantitative correlation with the concentration of the targeted antigen. We attribute the frequency shifts to mechanical perturbations in the antibody-reporter complex, as a result of antibody-antigen interaction forces. Our observation thus demonstrates the potentiality of an antibody-conjugated SERS-active reporter complex as a SERS-active nanomechanical sensor for biodetection. Remarkably, our sensing scheme, despite employing only one antibody, was found to be able to achieve detection sensitivity comparable to that of a conventional sandwich immunoassay. Additionally, we have carried out a proof-of-concept study into using multiple "stress-sensitive" SERS reporters for multiplexed detection of antigen-antibody bindings at the subdiffraction limit. The current work could therefore pave the way to realizing a label-free high-density protein nanoarray.
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Affiliation(s)
- Kiang Wei Kho
- The Blackett Laboratory, Imperial College London, Prince Consort Road, London, UK
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