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Gold Nanowire Forests for SERS Detection.

La Porta A, Grzelczak M, Liz-Marzán LM - ChemistryOpen (2014)

Bottom Line: This allowed us to select the optimum conditions for maximum electromagnetic enhancement and performance in surface enhanced Raman scattering (SERS) detection.SERS measurements confirmed the uniform and reproducible distribution of the nanowires on the substrate, with the subsequent high reproducibility of hot spot formation.Detection of malachite green in water and of 1-naphthalenethiol from the gas phase are demonstrated as proof-of-concept applications of these three-dimensional SERS substrates.

View Article: PubMed Central - PubMed

Affiliation: Bionanoplasmonics Laboratory, CIC biomaGUNE Paseo de Miramón 182, 20009 Donostia-San Sebastián (Spain) E-mail: llizmarzan@cicbiomagune.es.

ABSTRACT
Simple wet chemistry has been applied to control the vertical growth of gold nanowires on a glass substrate. As a consequence, the longitudinal localized surface plasmon band position can be tuned from 656 to 1477 nm in a few minutes by simply controlling the growth rate and time. This allowed us to select the optimum conditions for maximum electromagnetic enhancement and performance in surface enhanced Raman scattering (SERS) detection. SERS measurements confirmed the uniform and reproducible distribution of the nanowires on the substrate, with the subsequent high reproducibility of hot spot formation. Detection of malachite green in water and of 1-naphthalenethiol from the gas phase are demonstrated as proof-of-concept applications of these three-dimensional SERS substrates.

No MeSH data available.


Related in: MedlinePlus

Illustration of a detection cycle of MG, 1-NAT and R6G upon removal of MBA molecules from the Au NWs substrate. A) SERS spectrum of MBA right after the synthesis. B–D) SERS spectra of MG (B), 1-NAT (C) and R6G (D) after successive Ar+ plasma cleaning and dipping the substrate in the corresponding solution. Dipping time was 1 h for all samples.
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fig03: Illustration of a detection cycle of MG, 1-NAT and R6G upon removal of MBA molecules from the Au NWs substrate. A) SERS spectrum of MBA right after the synthesis. B–D) SERS spectra of MG (B), 1-NAT (C) and R6G (D) after successive Ar+ plasma cleaning and dipping the substrate in the corresponding solution. Dipping time was 1 h for all samples.

Mentions: Since plasma cleaning has been shown to remove adsorbed molecules from the Au NWs with no significant alteration of their morphology and optical response, we tested reusability of the substrates for detection of different analytes. Thus, after MG sensing, the same substrate was used to detect 1-naphthalenethiol (1-NAT) and rhodamine 6G (R6G), and the results are shown in Figure 3. MBA was first removed (Figure 3A) and MG was adsorbed and detected by SERS (Figure 3B). A second Ar+ plasma cleaning treatment was then applied to remove MG, and 1-NAT was allowed to absorb onto the Au NW surface (Figure 3C). Finally, a third plasma cleaning step enabled the detection of R6G (Figure 3D). In each SERS spectrum, all the main features of the corresponding analyte were visible: ν(C−C) and ring breathing at 1075 and 1589 cm−1, respectively, for MBA,37δ(C−H) and ν(N-Φ) for MG,40δ(C−H) and ring stretch for 1-NAT,41ν(C−C) and ν(C−N) for R6G.42 Complete band assignment is provided in Table S1 (Supporting Information). The corresponding UV/Vis spectra at each step revealed some broadening after the first plasma cleaning process, but no significant variations until the end of the entire cycle (Figure S4, Supporting Information).


Gold Nanowire Forests for SERS Detection.

La Porta A, Grzelczak M, Liz-Marzán LM - ChemistryOpen (2014)

Illustration of a detection cycle of MG, 1-NAT and R6G upon removal of MBA molecules from the Au NWs substrate. A) SERS spectrum of MBA right after the synthesis. B–D) SERS spectra of MG (B), 1-NAT (C) and R6G (D) after successive Ar+ plasma cleaning and dipping the substrate in the corresponding solution. Dipping time was 1 h for all samples.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4232270&req=5

fig03: Illustration of a detection cycle of MG, 1-NAT and R6G upon removal of MBA molecules from the Au NWs substrate. A) SERS spectrum of MBA right after the synthesis. B–D) SERS spectra of MG (B), 1-NAT (C) and R6G (D) after successive Ar+ plasma cleaning and dipping the substrate in the corresponding solution. Dipping time was 1 h for all samples.
Mentions: Since plasma cleaning has been shown to remove adsorbed molecules from the Au NWs with no significant alteration of their morphology and optical response, we tested reusability of the substrates for detection of different analytes. Thus, after MG sensing, the same substrate was used to detect 1-naphthalenethiol (1-NAT) and rhodamine 6G (R6G), and the results are shown in Figure 3. MBA was first removed (Figure 3A) and MG was adsorbed and detected by SERS (Figure 3B). A second Ar+ plasma cleaning treatment was then applied to remove MG, and 1-NAT was allowed to absorb onto the Au NW surface (Figure 3C). Finally, a third plasma cleaning step enabled the detection of R6G (Figure 3D). In each SERS spectrum, all the main features of the corresponding analyte were visible: ν(C−C) and ring breathing at 1075 and 1589 cm−1, respectively, for MBA,37δ(C−H) and ν(N-Φ) for MG,40δ(C−H) and ring stretch for 1-NAT,41ν(C−C) and ν(C−N) for R6G.42 Complete band assignment is provided in Table S1 (Supporting Information). The corresponding UV/Vis spectra at each step revealed some broadening after the first plasma cleaning process, but no significant variations until the end of the entire cycle (Figure S4, Supporting Information).

Bottom Line: This allowed us to select the optimum conditions for maximum electromagnetic enhancement and performance in surface enhanced Raman scattering (SERS) detection.SERS measurements confirmed the uniform and reproducible distribution of the nanowires on the substrate, with the subsequent high reproducibility of hot spot formation.Detection of malachite green in water and of 1-naphthalenethiol from the gas phase are demonstrated as proof-of-concept applications of these three-dimensional SERS substrates.

View Article: PubMed Central - PubMed

Affiliation: Bionanoplasmonics Laboratory, CIC biomaGUNE Paseo de Miramón 182, 20009 Donostia-San Sebastián (Spain) E-mail: llizmarzan@cicbiomagune.es.

ABSTRACT
Simple wet chemistry has been applied to control the vertical growth of gold nanowires on a glass substrate. As a consequence, the longitudinal localized surface plasmon band position can be tuned from 656 to 1477 nm in a few minutes by simply controlling the growth rate and time. This allowed us to select the optimum conditions for maximum electromagnetic enhancement and performance in surface enhanced Raman scattering (SERS) detection. SERS measurements confirmed the uniform and reproducible distribution of the nanowires on the substrate, with the subsequent high reproducibility of hot spot formation. Detection of malachite green in water and of 1-naphthalenethiol from the gas phase are demonstrated as proof-of-concept applications of these three-dimensional SERS substrates.

No MeSH data available.


Related in: MedlinePlus