Preparation of Surface-Enhanced Raman Scattering-Active Au/Al<sub>2</sub>O<sub>3</sub> Colloids by Sonoelectrochemical Methods

Der, Fu; Yu, Chih-Chang; Liu, Yu Chuan; Yang, Kuang Hsuan; Juang, Ming Yu

doi:10.1021/jp203931r

Cited by 14 publications

(10 citation statements)

References 51 publications

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“…Finally, the partial aggregation of Au NPs on the Al 2 O 3 surface may also be responsible for the enhancement of the SERS signal. 29…”

Section: Raman Detection Of Atpmentioning

confidence: 99%

“…[23][24][25][26] Au/Al 2 O 3 NCs and Ag/Al 2 O 3 NCs synthesized via the sonoelectrochemical method improved the thermal stability of the SERS substrates and exhibited excellent sensitivity. [27][28][29] In addition, alumina is widely employed as a polar adsorbent in chromatographic separations and has high affinity for molecules with strong polarity, indicating that alumina has the potential to selectively bind molecules. Based on this principle, Van Duyne et al 30 deposited a sub-1 nm alumina layer on silver lm-over-nanosphere (AgFON) substrates and exploited the high adsorption affinity of carboxylic acids to alumina-modied AgFON surfaces to detect calcium dipicolinate, a bacillus spore biomarker.…”

Section: Introductionmentioning

confidence: 99%

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Facile synthesis of Au/Al₂O₃nanocomposites for improving the detection sensitivity of adenosine triphosphate

Guo

et al. 2017

RSC Adv.

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Alumina is widely recognized as chemically inert, and resistant to oxidation and high temperature. In this study, Au/Al 2 O 3 nanocomposites (NCs) were prepared by a facile method and were used as a surface enhanced Raman scattering (SERS) substrate for detection of adenosine triphosphate (ATP). This Au/ Al 2 O 3 -based SERS substrate demonstrated good sensitivity with the lowest detectable concentration of 5 Â 10 À9 M for ATP and a good linear relationship ranging from 5 Â 10 À5 to 5 Â 10 À9 M. The strategy of improvement of SERS detection sensitivity for ATP was based on the consideration of ATP captured by such SERS substrate via chelation of aluminum and phosphates, which was validated by X-ray photoelectron spectroscopy. In addition, alumina as a supporting material could be expected to prolong the stability of such a SERS substrate. † Electronic supplementary information (ESI) available: SERS spectra of 10 À4 M ATP with different pH (Fig. S1). XPS patterns of P 2p of ATP adsorbed on Al 2 O 3 and pure ATP (Fig. S2). SERS spectra of 10 À5 M ATP and 10 À5 M adenosine on Au/Al 2 O 3 NCs, respectively (Fig. S3). See

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“…Finally, the partial aggregation of Au NPs on the Al 2 O 3 surface may also be responsible for the enhancement of the SERS signal. 29…”

Section: Raman Detection Of Atpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile synthesis of Au/Al₂O₃nanocomposites for improving the detection sensitivity of adenosine triphosphate

Guo

et al. 2017

RSC Adv.

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“…The EM field can be further enhanced when two NPs are so‐called proximity‐coupled, which in turn, gives rise to a strong EM field enhancement in the gap. These are referred to as “hot spots” . A number of studies have highlighted the importance of reducing the gap distance between coupled NPs, where they have shown that as the gap becomes narrower, a giant electric field is produced .…”

Section: Introductionmentioning

confidence: 99%

“…However, all these methods are either time‐consuming, expensive, not scalable, or limited in gap distance. On the other hand, large‐area scalable production methods such as pulsed laser deposition and colloidal metal NPs synthesis , produce randomly distributed NPs on the surface, with random gap sizes. Some studies have shown the fabrication of highly ordered and reproducible colloidal NP arrays .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of self-organized precisely tunable plasmonic SERS substrates via glancing angle deposition

Rezvani

Ualibek

Bulfin

et al. 2017

Phys. Status Solidi A

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Plasmonic nanostructures offer great enhancement of the Raman signal due to the strong confinement of the electromagnetic field. Thus, they are considered as suitable candidates for surface enhanced Raman spectroscopy (SERS). In this work, we present an alternative fabrication route, called the glancing angle deposition (GLAD), for tunable fabrication of plasmonic self-organized Ag nanoparticle arrays aimed at SERS. Using the GLAD technique, the inter-particle distance within the arrays can be made as small as 1 nm. Moreover, the plasmonic resonance can be precisely tuned over the whole visible range. The GLAD method can be up-scaled; and when a transparent substrate is used, it enables various measurement geometries. The enhancement factor for the employed probe molecule in this study, rhodamine 6G, is estimated to be in the order of $10 8 . It is noted that the nature of the GLAD-made substrates leads to the polarization dependence of the signal enhancement. The polarization studies show a stronger enhancement along the nanoparticles chain. OriginalPaper 1700088 (7 of 8) E. Rezvani et al.: Self-organized precisely tunable plasmonic SERS substrates ß

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“…On the other hand, SERS has the advantage of conforming chemical identity, through analysis of spectral features; thus, the detailed information on interfacial structures, adsorption mechanisms, and surface reactions would be obtained. Recently, the studies on NP‐R6G‐based aggregation have been further carried out, indicating the agglomerated sizes of the Au(−)NPs were approximately eight times larger than the Au(+) NPs upon the addition of R6G, which would induce a much shorter distance between the dye molecules and NPs, providing the hot spots to induce large SERS enhancement . Our experiment, however, would eliminate the NPs aggregation and contribution of electromagnetic mechanism, proving the enormous SERS intensity difference between target molecules that were assigned to chemical adsorption or charge transfer.…”

Section: Introductionmentioning

confidence: 99%

Surface‐enhanced Raman evidence for Rhodamine 6 G and its derivative with different adsorption geometry to colloidal silver nanoparticle

Zhou

Liu

et al. 2013

J Raman Spectroscopy

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Some high‐affinity functional groups or resonant molecules were often used as probe molecules adsorbed on silver nanoparticles for Surface‐enhanced Raman scattering (SERS). However, it is still unclear how the attached molecules interact with the silver nanoparticles' surface, and how the anchoring groups affect the optical and electronic properties of molecules. Here, we report that surface‐enhanced Raman studies of two organic compounds; rhodamine 6G (R6G) and its aminated derivative (R‐NH2) have very different functional groups for surface binding but nearly identical SERS spectroscopic properties at pH = 7 and UV–vis at pH = 3, respectively. A surprise was found that under the same experimental conditions, the SERS signal intensity for R6G is nearly 50‐fold higher than that of R‐NH2. Furthermore, the pH‐dependent study reveals that the structure of R6G is irreversibly stabilized or ‘locked’ in its form and no longer responsive to pH changes. In contrast, R‐NH2 is still sensitive to pH, and can be switched between its open‐ring and closed‐ring structures. Copyright © 2013 John Wiley & Sons, Ltd.

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Preparation of Surface-Enhanced Raman Scattering-Active Au/Al₂O₃ Colloids by Sonoelectrochemical Methods

Cited by 14 publications

References 51 publications

Facile synthesis of Au/Al₂O₃nanocomposites for improving the detection sensitivity of adenosine triphosphate

Facile synthesis of Au/Al₂O₃nanocomposites for improving the detection sensitivity of adenosine triphosphate

Fabrication of self-organized precisely tunable plasmonic SERS substrates via glancing angle deposition

Surface‐enhanced Raman evidence for Rhodamine 6 G and its derivative with different adsorption geometry to colloidal silver nanoparticle

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Preparation of Surface-Enhanced Raman Scattering-Active Au/Al2O3 Colloids by Sonoelectrochemical Methods

Cited by 14 publications

References 51 publications

Facile synthesis of Au/Al2O3nanocomposites for improving the detection sensitivity of adenosine triphosphate

Facile synthesis of Au/Al2O3nanocomposites for improving the detection sensitivity of adenosine triphosphate

Fabrication of self-organized precisely tunable plasmonic SERS substrates via glancing angle deposition

Surface‐enhanced Raman evidence for Rhodamine 6 G and its derivative with different adsorption geometry to colloidal silver nanoparticle

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Product

Resources

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Preparation of Surface-Enhanced Raman Scattering-Active Au/Al₂O₃ Colloids by Sonoelectrochemical Methods

Facile synthesis of Au/Al₂O₃nanocomposites for improving the detection sensitivity of adenosine triphosphate

Facile synthesis of Au/Al₂O₃nanocomposites for improving the detection sensitivity of adenosine triphosphate