Light-Induced Dynamic Assembly of Gold Nanoparticles in a Lab-on-Fiber Platform for Surface-Enhanced Raman Scattering Detection

Zheng, Zhidong; Shi, Min; Xu, Yu; Liu, Shaojing; Zhong, Huiqing; Shou, Qian; Huang, Jianlin; Luan, Tianyang; Li, Zongbao; Xing, Xiaobo

doi:10.1021/acsanm.2c01108

Cited by 9 publications

(8 citation statements)

References 37 publications

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“…[40] Moreover, biomolecules auto-fluoresce after absorbing 532 nm to add a fluorescence background in the SERS spectra. [40] Zheng et al [15] have built a lab-on-fiber platform for thermophoretic reversible assembly of cetyltrimethylammonium bromide (CTAB)-capped AuNPs and SERS measurements on R6G and a few environmental pollutant molecules. The platform uses a microfluidic channel integrated with a gold-coated fiber tip and dual-wavelength excitation for AuNP assembling and SERS.…”

Section: Discussionmentioning

confidence: 99%

“…In 2016, Kang et al demonstrated the laser-induced microbubble-assisted reversible assembly of PMNPs for SERS applications detecting rhodamine 6G (R6G) down to 10 −7 m. [14] In recent work, laser-induced thermophoresis on gold-coated fiber tip has been utilized to create a reversible dynamic assembly of gold nanoparticles (AuNPs) for SERS probing. [15] However, the involvement of surfactants in thermophoretic tweezers [15,16] and the high laser power used in microbubble formation can harm the stability of PMNPs and analytes.…”

Section: Introductionmentioning

confidence: 99%

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Surface‐Plasmon‐Polaritons for Reversible Assembly of Gold Nanoparticles, In Situ Nanogap Tuning, and SERS

Ghanashyam,

Sinha,

Bankapur

2023

Small Methods

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A transportable reversible assembly of gold nanoparticles (AuNPs) in an aqueous environment addresses the need for in situ surafce‐enhanced Raman spectroscopy (SERS) hotspot creation for biological applications. Usually, light‐directed AuNP assembly methods use higher laser powers and surfactants and are, hence, unsuitable for biological applications. Here, surface plasmon polaritons‐assisted dynamic assembly of AuNPs are demonstrated at laser power density as low as 100 nW µm−2. The AuNP assembly with multiple controllable hotspots is generated in an Au–water interface for solution‐based SERS measurements. The major advantage of the method is that the interparticle nanogap is tunable to achieve analyte and AuNP‐specific optimum SERS enhancement. The SERS intensity is reproducible on multiple reassembly cycles and assembly attempts, proving repeatability in the produced nanogap pattern. The assembly experiments reveal the influence of AuNP surface charge and the resulting polarizability on the SPP forces. The developed system and method can detect sulforhodamine 101 (SR101) dye molecules at concentrations as low as 10−10 m. Further, the SERS measurements on double‐stranded DNA suggest that the molecules are oriented in a fashion to expose adenosine to the enhanced field, leading to its dominance in the recorded spectra.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface‐Plasmon‐Polaritons for Reversible Assembly of Gold Nanoparticles, In Situ Nanogap Tuning, and SERS

Ghanashyam,

Sinha,

Bankapur

2023

Small Methods

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“…Recently, the thermophoresis‐based lab‐on‐fiber (LOF) has been developed for ultrasensitive SERS detection of environmental pollutants molecules. [ 159 ] The SERS analysis platform was obtained by integrating the gold thin film (20 nm)‐coated optical fiber into a patterned microfluidic chip. With the assistance of laser (1550 nm)‐induced photothermal effect, the rich hot spots on the gold‐coated fiber were obtained with the power ranging from 50 to 140 mW.…”

Section: Plasmonic Nanostructures‐assisted Optothermal Manipulation O...mentioning

confidence: 99%

“…k) The mechanism of AuNBP assembly on fiber end phase integrated to the microfluidic platform, optical images of l) AuNBP assembly and m) dispersion progress, SERS spectra of environmental pollutants such as n) pyrene and o) thiram solution at various concentration. Reproduced with permission [159]. Copyright 2022, American Chemical Society.…”

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confidence: 99%

Colloidal Manipulation through Plasmonic and Non‐plasmonic Laser‐Assisted Heating

George

2023

Laser & Photonics Reviews

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In spite of the long‐term awareness of the conversion of light to heat even in materials with low absorption coefficient via the photothermal effect and consequent usage of the effect to evaluate thermo‐optic properties of the materials, only recently has the thermal field created via photon‐to‐phonon conversion been exploited for manipulation of colloidal objects as well as living cells. As compared to conventional direct photon‐assisted manipulation via optical tweezers, the optothermal manipulation technique employs much lower optical source power and can manipulate particles over a long range. In this review, the working mechanisms, concepts, and applications of a series of recently established optothermal techniques are discussed for the manipulation of diverse species including micro/nanoparticles, biological cells, molecules, and micelles in various fluidic environments. The physical mechanism of the optical manipulation that relies on the coordinated action of thermal convection, Marangoni convection, thermophoresis, thermoelectricity, depletion attraction, and thermo‐osmotic flow is discussed in detail. With their low‐power operation, diverse functionalities, and simple optics employed, optothermal manipulation techniques are increasingly finding a wide range of applications in colloidal science, life sciences, materials science, and nanoscience, as well as in the developments of colloidal functional devices and nanomedicine.

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“…The combination of SERS and the optical fiber is receiving increasing attention due to its irreplaceable advantages such as good flexibility, robustness, compact structure, microscale, and remote monitoring of hazardous environments. − Since Mullen and Carron first demonstrated the original single-mode fiber optic SERS probes in 1991, many improvements have been made in fiber structures and mental nanostructures to achieve higher SERS detection sensitivity and better reproducibility. In the fiber structure, end-face-based fiber optic probes are the most commonly used method, which fixed metal nanostructures directly onto the fiber end face. ,, However, the laser is limited by the propagation of the fiber core and only excites the metal nanoparticles around the fiber core, which reduces the detection sensitivity of the optical fiber SERS sensor.…”

Section: Introductionmentioning

confidence: 99%

Fiber Optic SERS Sensor with Silver Nanocubes Attached Based on Evanescent Wave for Detecting Pesticide Residues

Tao,

Ge,

Dai

et al. 2023

ACS Appl. Mater. Interfaces

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Surface-enhanced Raman scattering (SERS) has great potential in the field of rapid detection of pesticide residues in food. In this paper, a fiber optic SERS sensor excited by evanescent waves was proposed for efficient detection of thiram. Silver nanocubes (Ag NCs) were prepared as SERS active substrates, which had much stronger electromagnetic field intensity than nanospheres under laser excitation due to much more "hot spots". By using the method of electrostatic adsorption and laser induction, Ag NCs were uniformly assembled at the fiber taper waist (FTW) for enhancing the Raman signal. Different from the traditional way of stimulation, evanescent wave excitation greatly increased the interaction area between the excitation and analyte, while reducing the damage of the excited light to the metal nanostructures. The methods proposed in this work have been successfully used to detect the pesticide residues of thiram and showed good detection performance. The detection limits for 4-Mercaptobenzoic acid (4-MBA) and thiram were determined to be 10 −9 and 10 −8 M, the corresponding enhancement factor could be 1.64 × 10 5 and 6.38 × 10 4 . Low concentration of thiram was detected in the peels of tomatoes and cucumbers, indicating its feasibility in actual sample detection. The combination of evanescent waves and SERS provides a new direction for the application of SERS sensors, which had great application potential in the field of pesticide residue detection.

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Light-Induced Dynamic Assembly of Gold Nanoparticles in a Lab-on-Fiber Platform for Surface-Enhanced Raman Scattering Detection

Cited by 9 publications

References 37 publications

Surface‐Plasmon‐Polaritons for Reversible Assembly of Gold Nanoparticles, In Situ Nanogap Tuning, and SERS

Surface‐Plasmon‐Polaritons for Reversible Assembly of Gold Nanoparticles, In Situ Nanogap Tuning, and SERS

Colloidal Manipulation through Plasmonic and Non‐plasmonic Laser‐Assisted Heating

Fiber Optic SERS Sensor with Silver Nanocubes Attached Based on Evanescent Wave for Detecting Pesticide Residues

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