Ag Nanorods Coated with Ultrathin TiO2 Shells as Stable and Recyclable SERS Substrates

Ma, Li; Huang, Yu; Hou, Mengjing; Xie, Zheng; Zhang, Zhengjun

doi:10.1038/srep15442

Cited by 86 publications

(81 citation statements)

References 61 publications

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“…However, the previously reported techniques such as the use of metal oxide or inert metal coating layers only offer stability improvement at the sacrifice of SERS sensitivity1122232427282930313233. In order to truly examine the value of the proposed technique towards SERS substrate fabrication, the stability of both p-AuAg-NWs array (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Unlike our controlled dealloying process, Raman intensities for the 1078 and 1586 cm −1 Raman peaks were significantly improved by 72 and 124% and also maintained 100% of initial signal for at least 35 days. Several other materials such as graphene2429, silica31, Au23, polyvinyl alcohol (PVA)33 were employed as coating layer for an excellent stability improvement. Unfortunately, all of them also exhibited the initial reduction of SERS signal.…”

Section: Resultsmentioning

confidence: 99%

“…Several designs of SERS structures were demonstrated using a thin oxide layer (i.e. TiO 2 , Al 2 O 3 )1122, Au shell23, and graphene coatings24. Unfortunately, a long-term stability cannot be achieved without compromising SERS sensitivity.…”

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confidence: 99%

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Site-Selective Controlled Dealloying Process of Gold-Silver Nanowire Array: a Simple Approach towards Long-Term Stability and Sensitivity Improvement of SERS Substrate

Wiriyakun

Pankhlueab

Boonrungsiman

et al. 2016

Sci Rep

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Limitations of achieving highly sensitive and stable surface-enhanced Raman scattering (SERS) substrate greatly concern the suitable method for fabrication of large-area plasmonic nanostructures. Herein we report a simple approach using template-based synthesis to create a highly ordered two-dimensional array of gold-silver alloy nanowires, followed by the controlled dealloying process. This particular step of mild acid etching (15%v/v nitric acid for 5 min) allowed the formation of Raman hot spots on the nanowire tips while maintaining the integrity of highly active alloy composition and rigid nanowire array structure. Full consideration of SERS substrate performance was accomplished using 4-mercaptobenzoic acid (4-MBA) as a probe molecule. Exceedingly higher SERS signal (150-fold) can be achieved with respect to typical gold film substrate. Moreover, an excellent stability of SERS substrate was also determined for over 3 months storage time. In contrast to the previous studies which stability improvement was accomplished at a cost of sensitivity reduction, the simultaneous improvement of sensitivity and stability makes the controlled dealloying process an excellent choice of SERS substrate fabrication. In addition, uniformity and reproducibility studies indicated satisfactory results with the acceptable values of relative standard deviation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Site-Selective Controlled Dealloying Process of Gold-Silver Nanowire Array: a Simple Approach towards Long-Term Stability and Sensitivity Improvement of SERS Substrate

Wiriyakun

Pankhlueab

Boonrungsiman

et al. 2016

Sci Rep

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“…21 Indeed, noble metal-induced electromagnetic enhancement and semiconductors-induced chemical enhancement could synergistically contribute to stronger enhancement possibility. [22][23][24][25] Therefore, simple and economical approaches enabling highly ordered growth of 3D ZnO NWA with noble metals in large-scale are inevitable for obtaining efficient SERS substrates.…”

Section: Introductionmentioning

confidence: 99%

Wetting properties and SERS applications of ZnO/Ag nanowire arrays patterned by a screen printing method

et al. 2016

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Three-dimension (3D) ZnO/Ag nanowire arrays (NWA) SERS substrates are fabricated by screen printing technique. The preparation of patterned ZnO NWA involves a two-step growth process. The ZnO nanoparticles (NPs)-based ink is prepared and printed as seed layers, which are used as templates to fabricate patterned ZnO NWA via a hydrothermal method. During the screen printing process, the patterns of ZnO NWA are controlled by printing plates. The as-obtained NWA with 2 uniform morphology was fabricated at 90 °C, which exhibit hydrophilic and lipophilic properties.Subsequently, the sensitive 3D SERS substrates are fabricated through deposition of Ag NPs onto the surface of patterned ZnO NWA by magnetron sputtering. The detection limit of Malachite green (MG) can achieve 10 -12 M with an enhancement factor of about 2.5×10 10 . Combined with the sensitivity and uniformity, the ZnO/Ag NWA is applied for the quick detection of low concentrations of molecules related to food safety, such as amoxicillin.

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“…Ma et al have used OAD for reusable SERS substrates [86,87], where the metal nanorod arrays are further coated with a transition metal oxide. In [86], TiO 2 was used as a thin protective layer to prevent oxidation and sulfuration of the Ag nanorod array. Here the substrates could be renewed through simple ultraviolet illumination and water dilution.…”

Section: Reusable Sers Substratesmentioning

confidence: 99%

Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications

Chu

Song

et al. 2017

Coatings

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Surface Enhanced Raman Spectroscopy presents a rapid, non-destructive method to identify chemical and biological samples with up to single molecule sensitivity. Since its discovery in 1974, the technique has become an intense field of interdisciplinary research, typically generating >2000 publications per year since 2011. The technique relies on the localised surface plasmon resonance phenomenon, where incident light can couple with plasmons at the interface that result in the generation of an intense electric field. This field can propagate from the surface from the metal-dielectric interface, so molecules within proximity will experience more intense Raman scattering. Localised surface plasmon resonance wavelength is determined by a number of factors, such as size, geometry and material. Due to the requirements of the surface optical response, Ag and Au are typical metals used for surface enhanced Raman applications. These metals then need to have nano features that improve the localised surface plasmon resonance, several variants of these substrates exist; surfaces can range from nanoparticles in a suspension, electrochemically roughened electrodes to metal nanostructures on a substrate. The latter will be the focus of this review, particularly reviewing substrates made by oblique angle deposition. Oblique angle deposition is the technique of growing thin films so that the material flux is not normal to the surface. Films grown in this fashion will possess nanostructures, due to the atomic self-shadowing effect, that are dependent mainly on the deposition angle. Recent developments, applications and highlights of surface enhanced Raman scattering substrates made by oblique angle deposition will be reviewed.Keywords: surface enhanced Raman spectroscopy; coatings on polymer; special substrate materials; metal coatings; deposition, characterisations and applications of sculptured and textured thin films

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Ag Nanorods Coated with Ultrathin TiO2 Shells as Stable and Recyclable SERS Substrates

Cited by 86 publications

References 61 publications

Site-Selective Controlled Dealloying Process of Gold-Silver Nanowire Array: a Simple Approach towards Long-Term Stability and Sensitivity Improvement of SERS Substrate

Site-Selective Controlled Dealloying Process of Gold-Silver Nanowire Array: a Simple Approach towards Long-Term Stability and Sensitivity Improvement of SERS Substrate

Wetting properties and SERS applications of ZnO/Ag nanowire arrays patterned by a screen printing method

Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications

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