Tunable gold nanostars for surface enhanced Raman spectroscopy

Giorgetti, E.; Trigari, Silvana; Rindi, Alessio; Margheri, Giancarlo; Sottini, S.; Dellepiane, G.; Brusatin, Giovanna; Brigo, Laura; Muniz‐Miranda, Maurizio; Timtcheva, I.

doi:10.1002/pssb.201100488

Cited by 10 publications

(11 citation statements)

References 10 publications

(14 reference statements)

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“…For example in previously cited paper gold nanostars were conjugated with cyclic RGD and NIR fl uorescence probe or anticancer drug ( DOX ) to obtain multifunctional nanoconstructs [ 82 ]. Using tumor cells and tumor-bearing mice, these imaging nanoparticles demonstrated favorable tumor-targeting capability mediated by RGD peptide binding to its over-expressed receptor on the tumor cells.…”

Section: Other Examples Of Functionalization Of Gnsmentioning

confidence: 99%

“…The functionalization of GNS with different types of dyes and the properties of resulted systems were thoroughly discussed. For example, the functionalization of GNS with NAFTA6 dye, a derivative of 4-methoxy-1,8-naphthalimide bearing at the imide N-atom a long aliphatic chain with an SH terminal group, was reported [ 82 ]. In a second work, cyclic RGD peptide-modifi ed GNS were subsequently labeled with a hydrophilic indocyanine green derivative (NIR fl uorescent probe), to investigate the biodistribution of GNS and to assess the selective uptake of Au NS in tumors after attachment of cRGD [ 83 ].…”

Section: Functionalization Of Gns With Dyesmentioning

confidence: 99%

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Gold Nanostar Synthesis and Functionalization with Organic Molecules

Pallavicini

Cabrini

Borzenkov

2015

SpringerBriefs in Materials

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Section: Other Examples Of Functionalization Of Gnsmentioning

confidence: 99%

Section: Functionalization Of Gns With Dyesmentioning

confidence: 99%

Gold Nanostar Synthesis and Functionalization with Organic Molecules

Pallavicini

Cabrini

Borzenkov

2015

SpringerBriefs in Materials

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“…Stable GNS were fabricated with tunable extinction properties from the visible spectral region up to 1800 nm, depending on the average values of core size and branch length [ 14 ]. Theoretical computations of the plasmonic properties of these nanoparticles have put into evidence the existence of hot spots located on the tips of the nanostars for wavelengths up to 1800 nm, which opens the way to the improvement of diagnostics in the IR region.…”

Section: Application Of Gns For Sensing Assaysmentioning

confidence: 99%

Applications of Gold Nanostars: Nanosensing, Thermal Therapy, Delivery Systems

et al. 2015

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This chapter focuses on the most relevant applications of GNS in life science. The versatility of the GNS functionalization is combined with their optical properties to provide promising and prospective approaches in a variety of biomedical fi elds. Nanosensing assays, thermal treatments, and delivery systems based on GNS are discussed in this chapter. Keywords SERS-based sensing • Hyperthermia • Photothermal effect • Smart deliveryFunctionalized gold nanoparticles with controlled geometrical and optical properties are the subject of intensive studies and biomedical applications, including genomics, biosensors, immunoassays, clinical chemistry, laser phototherapy of cancer cells and tumors, and delivery platforms. In these fi elds targeted delivery of drugs, DNA, and antigens is coupled to optical bioimaging and the possibility to monitor cells and image details of tissues with the use of state-of-the-art detection systems [ 1 ]. Nonspherical gold nanoparticles are particularly interesting due to their capability to release locally heat with large effi ciency when they are irradiated in the NIR region of the spectrum [ 2 ]. In addition their size and the shape anisotropy essentially determine the position and the amplitude of the NIR-localized surface plasmon resonance [ 3 ]. The shape of the gold nanostars (GNS), in particular, can be tuned from the shape of sea urchin to that of planar, highly regular penta-branched stars [ 4 ]. The NIR-localized surface plasmon resonance of GNS can be consequently tuned in a wide NIR range up to 1250 nm by varying the axial ratio of protruding branches and multiple LSPR band in the NIR can also be obtained [ 4 ]. The possibility to easily decorate the surface of GNS, in combination with their optical properties

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“…Moreover, these materials can be transmogrified into different shapes and sizes, so that their intrinsic properties can be tuned for specific applications spread over aw ide range of fields,i ncluding medicine, biology,c hemistry,e nergy,e nvironmenta nd electronics. [3] The order of anisotro-py predominates in star-shaped nanomaterials, and hence, they are the desired platform for investigating SERS signal properties by means of Ramans pectroscopics tudies. [1] To date, av ariety of nanostructures of gold have been designed and prepared, including nanospheres, nanorods, nanoprisms,n anowires and nanostars (NS).…”

Section: Introductionmentioning

confidence: 99%

Controlled Growth of Gold Nanostars: Effect of Spike Length on SERS Signal Enhancement

2017

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Two different types of gold nanostars (Au NS), namely, short-spiked nanostars (SSNS) and long-spiked nanostars (LSNS), are prepared by using a hexagonal lyotropic liquid-crystalline (LLC) phase as a template. The formation, size and length of spikes or arms of the resultant Au NS are controlled by preparation in either a hexagonal LLC phase or an isotropic phase. These NS are anchored onto indium tin oxide (ITO) electrodes through a self-assembled monolayer of 3-mercaptopropyltrimethoxysilane, which acts as a linker molecule. Structural and morphological characterisations of SSNS- and LSNS-anchored ITO electrodes are performed by means of microscopic and spectroscopic analyses. Further electrochemical techniques, namely, cyclic voltammetry and electrochemical impedance spectroscopy, are also used to confirm the immobilisation of these Au NS on ITO electrodes and to study the electrochemical characteristics. These studies clearly reveal the formation of star-shaped, branched, anisotropic nanostructures of gold during the template preparation method and these Au NS are successfully anchored onto ITO electrodes through a covalent immobilisation strategy. Furthermore, the SERS activity of these Au NS is analysed by using glutathione and crystal violet as analytes and by employing glass and ITO as substrates. It is interesting to note that SSNS show a significant enhancement in SERS signals relative to those of LSNS.

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Tunable gold nanostars for surface enhanced Raman spectroscopy

Cited by 10 publications

References 10 publications

Gold Nanostar Synthesis and Functionalization with Organic Molecules

Gold Nanostar Synthesis and Functionalization with Organic Molecules

Applications of Gold Nanostars: Nanosensing, Thermal Therapy, Delivery Systems

Controlled Growth of Gold Nanostars: Effect of Spike Length on SERS Signal Enhancement

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