Self-assembled vertically aligned gold nanorod superlattices for ultra-high sensitive detection of molecules

Apte, Amey; Bhaskar, Prashant; Das, Raja; Chaturvedi, Smita; Poddar, Pankaj; Kulkarni, Sulabha K.

doi:10.1007/s12274-014-0572-2

Cited by 27 publications

(19 citation statements)

References 46 publications

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“…Combining these advantages, it can be considered that the self-assembled substrate has great potential in promoting SERS. Recently, some research groups have reported gold nanorod (GNR) self-assembled substrates for SERS [19–21]. However, as far as we know, the influence of a change in the morphology of the GNR vertical arrays substrate on the Raman signals of the target molecules has been rarely studied.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Vertical Arrays of Gold Nanorods by Self-Assembly: Physical Mechanism and Application

et al. 2019

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The unique photonic effect of self-assembled metal nanoparticles is widely used in many applications. In this article, we prepared self-assembled gold nanorod (GNR) vertical arrays substrate by an evaporation method and found that the morphology of the substrate can be effectively regulated by changing the immersion time in the target molecules solution to obtain different Raman enhancement effects. We separately calculated the local electromagnetic field of the GNR vertical arrays and disorder substrate by the finite element method (FEM), which was consistent with the experimental results. Based on optimal soaking time, the sensitivity, reproducibility, and stability of substrates were separately studied. The experimental results show that the GNR vertical arrays can detect Rhodamine 6G (Rh6G) at concentrations as low as 10 −11 M and exhibit good reproducibility and stability due to local electromagnetic (EM) field enhancement caused by the coupling of adjacent nanorods. Thus, our work can demonstrate that the substrate has excellent surface-enhanced Raman scattering (SERS) activity and the obtained GNR vertical arrays have great potential for biosensor and biodetection.

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Section: Introductionmentioning

confidence: 99%

Nanoscale Vertical Arrays of Gold Nanorods by Self-Assembly: Physical Mechanism and Application

et al. 2019

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“…The growth solution contains Au(III) ions, a reducing agent and a surfactant. Many efforts also have been made to align noble metal NRs or NWs with various techniques, such as electron-beam lithography [14–15], Langmuir–Blodgett (L–B) methods [16], stretched polymer matrices [17], self-assembly [18–20], and electric fields [21]. …”

Section: Introductionmentioning

confidence: 99%

Direct formation of gold nanorods on surfaces using polymer-immobilised gold seeds

Abyaneh

Parisse

Casalis

2016

Beilstein J. Nanotechnol.

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SummaryHerein, we present the formation of gold nanorods (GNRs) on novel gold–poly(methyl methacrylate) (Au–PMMA) nanocomposite substrates with unprecedented growth control through the polymer molecular weight (M w) and gold-salt-to-polymer weight ratio. For the first time, GNRs have been produced by seed-mediated direct growth on surfaces that were pre-coated with polymer-immobilised gold seeds. A Au–PMMA nanocomposite formed by UV photoreduction has been used as the gold seed. The influence of polymer M w and gold concentration on the formation of GNRs has been investigated and discussed. The polymer nanocomposite formed with a lower M w PMMA and 20 wt % gold salt provides a suitable medium for growing well-dispersed GNRs. In this sample, the average dimension of produced GNRs is 200 nm in length with aspect ratios up to 10 and a distribution of GNRs to nanoparticles of nearly 22%. Suitable characterization techniques such as AFM and SEM have been used to support concept of the proposed growth method.

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“…The SPR can be adjusted by the change in the size, shape, and composition of AuNPs . AuNPs show strong absorption and elastic scattering of visible and near‐infrared light upon excitation of their SPR which is the basis of many biological sensing and imaging applications . The light scattering from the AuNPs is intense and bright which does not photobleach or blink in comparison to organic fluorophores or semiconductor quantum dots …”

Section: Gold Nanoparticles and Their Antibacterial Applicationsmentioning

confidence: 99%

Advances in the Experimental and Theoretical Understandings of Antibiotic Conjugated Gold Nanoparticles for Antibacterial Applications

2019

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The worldwide bacterial resistance to a wide range of antibiotics originates a global health concern and calls for the development of new antibacterial agents. Over the recent years, nanomaterials-based agents have been proven to be useful for the effective antibacterial applications. Notably, the gold nanoparticles (AuNPs) draw particular attention due to their biological inertness and easy surface functionalization. It is now established that the antibiotic functionalization on the AuNPs surfaces increases the antibacterial efficacy even towards the antibiotic-resistant bacterial cells. Moreover, the antibacterial efficacy can be further enhanced by photothermal therapy using antibiotic conjugated AuNPs. In this review article, we have reviewed the advances in the development of the synthesis methods of antibiotic conjugated AuNPs and gold nanoclusters, and their antibacterial efficacy. We have also discussed the developments in the theoretical understandings behind the interaction of antibiotic molecules with gold surface and its relation to the antibacterial activity. We believe that few parameters including the selection of antibiotic molecules, the method of its attachment to AuNPs, the purification of antibiotic conjugated AuNPs, and the quantification of conjugated antibiotic are crucial and needs to be properly addressed. Moreover, there are many other future directions discussed, for using antibiotic conjugated AuNPs more effectively for antibacterial therapy.[a] Dr.

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Self-assembled vertically aligned gold nanorod superlattices for ultra-high sensitive detection of molecules

Cited by 27 publications

References 46 publications

Nanoscale Vertical Arrays of Gold Nanorods by Self-Assembly: Physical Mechanism and Application

Nanoscale Vertical Arrays of Gold Nanorods by Self-Assembly: Physical Mechanism and Application

Direct formation of gold nanorods on surfaces using polymer-immobilised gold seeds

Advances in the Experimental and Theoretical Understandings of Antibiotic Conjugated Gold Nanoparticles for Antibacterial Applications

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