Nanorod decorated nanowires as highly efficient SERS-active hybrids

Kattumenu, Ramesh; Lee, Chang H.; Tian, Limei; McConney, Michael E.; Singamaneni, Srikanth

doi:10.1039/c1jm12426a

Cited by 32 publications

(30 citation statements)

References 55 publications

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“…The refractive index sensitivity of localized surface plasmon resonance (LSPR) of plasmonic nanostructures renders it an attractive transduction platform for chemical and biological sensing (Abbas et al, 2013b; Anker et al, 2008; Englebienne, 1998; Haes et al, 2005; Haes and Van Duyne, 2002; Kattumenu et al, 2011; Maier and Atwater, 2005; Mayer and Hafner, 2011; Riboh et al, 2003; Rosi and Mirkin, 2005; Sepúlveda et al, 2009; Svedendahl et al, 2009; Yonzon et al, 2004). We have recently demonstrated plasmonic paper comprised of biofunctionalized gold nanorods (AuNRs) uniformly adsorbed on paper substrates (Tian et al, 2012c).…”

Section: Introductionmentioning

confidence: 99%

Bioplasmonic calligraphy for multiplexed label-free biodetection

Tian

Tadepalli

Park

et al. 2014

Biosensors and Bioelectronics

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Printable multi-marker biochips that enable simultaneous quantitative detection of multiple target biomarkers in point-of-care and resource-limited settings are a holy grail in the field of biodiagnostics. However, preserving the functionality of biomolecules, which are routinely employed as recognition elements, during conventional printing approaches remains challenging. In this article, we introduce a simple yet powerful approach, namely plasmonic calligraphy, for realizing multiplexed label-free bioassays. Plasmonic calligraphy involves a regular ballpoint pen filled with biofunctionalized gold nanorods as plasmonic ink for creating isolated test domains on paper substrates. Biofriendly plasmonic calligraphy approach serves as a facile method to miniaturize the test domain size to few mm2, which significantly improves the sensitivity of the plasmonic biosensor compared to bioplasmonic paper fabricated using immersion approach. Furthermore, plasmonic calligraphy also serves as a simple and efficient means to isolate multiple test domains on a single test strip, which facilitates multiplexed biodetection and multi-marker biochips. Plasmonic calligraphy, which can be potentially automated by implementing with a robotic arm, serves as an alternate path forward to overcome the limitations of conventional ink-jet printing.

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Section: Introductionmentioning

confidence: 99%

Bioplasmonic calligraphy for multiplexed label-free biodetection

Tian

Tadepalli

Park

et al. 2014

Biosensors and Bioelectronics

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“…high hot spot concentrations). [11,12] A variety of three-dimensional (3D) nanostructures that exhibit high SERS enhancement have been reported, such as metallic nanohole arrays, [8] nanoporous metallic substrates, [13,14] metal modified microstructured optical fibre substrates, [2,8] nanowire-based substrates, [15] and nanotube networks decorated with metals.[16] Metallic NPs can also serve as effective hot spot, that is, sites that interconnect to the molecules adsorbed on the SERS-active substrate. [15,17] Jiang et al [5] demonstrated that porous structures contribute to the metallic NP aggregation onto nanowires; the corresponding nanogaps provided strong collective surface plasmon resonances with superior SERS activity.…”

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confidence: 99%

“…The magnitude of these fields (and consequently the SERS enhancement) are highly dependent on the nanoscale composition, shape, size, and arrangement of the material. [8][9][10] However, despite the large SERS enhancement from localized surface plasmon resonances (hot spots), the average enhancement over a large-scale area is still rather low. [11] Thus, efforts are ongoing to fabricate versatile SERS-active substrates with high aspect-ratio nanostructures and broad plasmon resonances (i.e.…”

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Porosity‐Controlled Eggshell Membrane as 3D SERS‐Active Substrate

et al. 2014

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We report on the fabrication of a surface-enhanced Raman scattering (SERS) platform, comprised of a three-dimensional (3D) porous eggshell membrane (ESM) scaffold decorated with Ag nanoparticles (NPs). Both native and treated ESM were used, where the treated ESM pore size and fiber crossing density was controlled by timed exposure to hydrogen peroxide (H2O2). Ag NPs were synthesized in situ by reduction of silver nitrate with ascorbic acid. Our results demonstrate that H2O2-treated Ag-ESM provides a more densely packed 3D network of active material, which leads to consistently higher SERS enhancement than untreated Ag-ESM substrates.

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“…Mostly silver and gold nanostructures and colloids with dimension less than 100 nm are used because of their suitable optical properties to sustain plasmon resonances in the visible and near-infrared range [2]. However, in terms of the shape of the structures wide diversity is observed, from metallic colloids in solution to structures like: nanowires [10][11][12], nanorods [13,14], nanocomb arrays [15], nanocluster films [16,17], deserrose-like [18] or dendritic nanostructures [19]. Although a variety of electrochemical, nanolitographic and deposition methods or synthesis have been employed with some success to fabricate SERS [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%