Stretchable plasmonic substrate with tunable resonances for surface-enhanced Raman spectroscopy

Wen, Jinxiu; Chen, Huanjun; Zhang, Weihong; Chen, Jian

doi:10.1088/2040-8978/17/11/114015

Cited by 19 publications

(17 citation statements)

References 41 publications

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“…The SERS substrate on glass was immersed into an ethanol solution of 4-MBT (1 M) and left undisturbed for 8 h, followed by rinsing with copious amount of ethanol and DI water to remove the excessive 4-MBT molecules [ 12 ]. Finally, the substrate was blown dry by nitrogen before the Raman measurements.…”

Section: Methodsmentioning

confidence: 99%

Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios

Zhuang

et al. 2018

Sensors

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Plasmonic gold nanorods play important roles in nowadays state-of-the-art plasmonic sensing techniques. Most of the previous studies and applications focused on gold nanorods with relatively small aspect ratios, where the plasmon wavelengths are smaller than 900 nm. Gold nanorods with large aspect ratios are predicted to exhibit high refractive-index sensitivity (Langmir 2008, 24, 5233–5237), which therefore should be promising for the development of high-performance plasmonic chemical- and bio-sensors. In this study, we developed gold nanorods with aspect ratios over 7.9, which exhibit plasmon resonances around 1064 nm. The refractive index (RI) sensitivity of these nanorods have been evaluated by varying their dielectric environment, whereby a sensitivity as high as 473 nm/RIU (refractive index unit) can be obtained. Furthermore, we have demonstrated the large-aspect-ratio nanorods as efficient substrate for surface enhanced Raman spectroscopy (SERS), where an enhancement factor (EF) as high as 9.47 × 108 was measured using 4-methylbenzenethiol (4-MBT) as probe molecule. Finally, a type of flexible SERS substrate is developed by conjugating the gold nanorods with the polystyrene (PS) polymer. The results obtained in our study can benefit the development of plasmonic sensing techniques utilized in the near-infrared spectral region.

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Section: Methodsmentioning

confidence: 99%

Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios

Zhuang

et al. 2018

Sensors

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“…After carefully adjusting the experiment conditions, we found that a 6-h immersion of the thiol-functionalized glass substrate into the nanorod aqueous solution can give optimum distributions of the nanorods onto the glass substrate. The 4-MBT was selected as probe molecules for evaluating the Raman enhancement factor (EF) of the SERS substrate, which can be adsorbed onto the gold surface to form a well-defined monolayer via its thiol group [12]. One advantage of the 4-MBT molecules as SERS probe molecules is that they exhibit clear molecular fingerprints in 400-2000 cm -1 spectral region, which can help for precisely calculating the Raman enhancement factor of a SERS substrate.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios

Zhuang¹,

Xu²,

Xu³

et al. 2018

Preprint

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Plasmonic gold nanorods play important roles in nowadays state-of-the-art plasmonic sensing techniques. Most of the previous studies and applications focused on gold nanorods with relatively small aspect ratios, where the plasmon wavelengths are smaller than 900 nm. Gold nanorods with large aspect ratios are predicted to exhibit high refractive-index sensitivity (Langmir 2008, 24, 5233–5237.), which therefore should be promising for developing of high-performance plasmonic chemical- and bio-sensors. In this study, we developed gold nanorods with aspect ratios over 7.9, which exhibit plasmon resonances around 1064 nm. The refractive index (RI) sensitivity of these nanorods have been evaluated by varying their dielectric environment, whereby a sensitivity as high as 473 nm/RIU can be obtained. Furthermore, we have demonstrated the large-aspect-ratio nanorods as efficient substrate for surface enhanced Raman spectroscopy (SERS), where an enhancement factor (EF) as high as 9.47×108 was measured using 4-methylbenzenethiol (4-MBT) as probe molecule. Finally, a type of flexible SERS substrate is developed by conjugating the gold nanorods with the polystyrene (PS) polymer. The results obtained in our study can benefit the development of plasmonic sensing techniques utilized in the near-infrared spectral region.

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“…The Au nanorods (Au NRs) used in this study were synthesized using the seed-mediated growth method, which has been reported in our previous work [ 14 , 28 ]. Scanning electron microscopy (SEM) images confirm that large-area uniform Au NRs were obtained on the glass sheets for SERS ( Figure 1 A).…”

Section: Resultsmentioning

confidence: 99%

“…Au NRs were synthesized by seed-mediated growth method, which has been reported in our previous work [ 14 , 28 ]. The ice-cold NaBH 4 aqueous solution (600 µL, 0.1 M) was rapidly prepared and added into the HAuCl 4 (250 µL, 10 mM) and CTAB (9.75 mL, 0.1 M) aqueous mixture.…”

Section: Methodsmentioning

confidence: 99%

A Simple and Highly Sensitive Thymine Sensor for Mercury Ion Detection Based on Surface Enhanced Raman Spectroscopy and the Mechanism Study

Yang¹,

Ye²,

Fu³

et al. 2017

Nanomaterials

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Mercury ion (Hg2+) is recognized as one of the most toxic metal ions for the environment and for human health. Techniques utilized in the detection of Hg2+ are an important factor. Herein, a simple thymine was successfully employed as the surface enhanced Raman spectroscopy sensor for Hg2+ ion detection. The limit of detection (LOD) of the developed sensor is better than 0.1 nM (0.02 ppb). This sensor can also selectively distinguish Hg2+ ions over 7 types of alkali, heavy metal and transition-metal ions. Moreover, the LOD of the sensor can even achieve 1 ppb in practical application in the nature system, which is half the maximum allowable level (10 nM, 2 ppb) stipulated in the US Environmental Protection Agency standard. Further investigation of the thymine-Hg2+-thymine coordination mechanism provides a possible means of detecting other metal ions by replacing the metal ion-specific ligands. This work paves the way for the detection of toxic metal ions and environmental problems.

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Stretchable plasmonic substrate with tunable resonances for surface-enhanced Raman spectroscopy

Cited by 19 publications

References 41 publications

Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios

Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios

Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios

A Simple and Highly Sensitive Thymine Sensor for Mercury Ion Detection Based on Surface Enhanced Raman Spectroscopy and the Mechanism Study

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