Unprecedented high plasmonic sensitivity of substrates based on gold nanoparticles

Silva, Cleiser T.P. da; Monteiro, Johny P.; Radovanovic, Eduardo; Girotto, Emerson M.

doi:10.1016/j.snb.2013.09.109

Cited by 25 publications

(14 citation statements)

References 37 publications

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“…This causes a relaxation in the polymer three‐dimensional chains that allows the entry of AuNPs. Nanoparticles then remain adsorbed into the gel matrix due to electrostatic interactions with the polymer chains caused to the presence of primary amines in the polymer (interaction between primary amines and gold nanoparticles have been reported elsewhere). Then, the swollen composite was placed in contact with BSA solution so that the protein molecules may diffuse into the hydrogel.…”

Section: Resultsmentioning

confidence: 98%

Plasmonic device based on a PAAm hydrogel/gold nanoparticles composite

Monteiro

Predabon

Silva

et al. 2015

J of Applied Polymer Sci

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Stimuli-resposive hydrogels, such as poly(acrylamide), are smart materials that can be loaded with gold nanoparticles to explore the localized surface plasmon resonance effect to develop an optical device. Here we used electropolymerized poly(acrylamide) hydrogel for entrapped gold nanoparticles into gel structure (composite) to prepare a plasmonic device. Sensing tests were performed; for this bovine serum albumin molecules were placed into the composite by diffusion from an aqueous solution. The presence of the molecules alters the refractive index around the gold nanoparticles, changing its resonance conditions. The plasmonic band shifted 3.8 nm when the composite was incubated at the 20 mg/mL bovine serum albumin solution, which is a result comparable to reports elsewhere using gold nanoparticles on glass substrates. The device showed that it was possible to detect significantly low concentrations up to 10 ng/mL of protein in aqueous solution.

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Section: Resultsmentioning

confidence: 98%

Plasmonic device based on a PAAm hydrogel/gold nanoparticles composite

Monteiro

Predabon

Silva

et al. 2015

J of Applied Polymer Sci

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“…To demonstrate the use of the gold nanocheckerboard metasurface as a plasmonic biological sensor, we chose BSA and anti‐BSA as model proteins and investigated their specific interactions on the metasurface. To immobilize BSA, the gold nanocheckerboard metasurface was sequentially modified by 11‐mercaptoundecanoic acid (MUA) and N ‐hydroxysuccinimide (NHS) . The LSPR displacements after each step were evaluated through transmission spectroscopy (Figure S6, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Solution‐Processed Large‐Area Gold Nanocheckerboard Metasurfaces on Flexible Plastics for Plasmonic Biomolecular Sensing

Cai

Zhang

Liang

et al. 2019

Advanced Optical Materials

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A versatile, solution‐processed fabrication strategy combining interference lithography, electroplating, and imprint transfer is developed to realize plastic plasmonic metasurfaces for biomolecular sensing applications. This process is potentially suitable for high‐throughput, large‐volume, and low‐cost production of plasmonic metasurfaces. Gold nanocheckerboard metasurfaces are fabricated using this method and show enhanced performance in plasmonic refractometric sensing applications compared to other localized surface plasmon resonance (LSPR) sensors. An excellent refractive index sensitivity of 435.1 nm RIU−1 and a figure of merit (FoM) of 7.38 are demonstrated for the prototype plasmonic sensors at wavelengths of 570–610 nm. The spectral regions used in sensing are located within the operating wavelength of silicon photodiodes, which allows low analytical instrumentation cost. A plasmonic biosensor is also constructed on the metasurfaces by monitoring the LSPR peak shift that occurs upon high‐affinity biomolecular interactions between bovine serum albumin (BSA) and anti‐BSA proteins. Moreover, excellent mechanical stability against repeated bending is demonstrated for the plasmonic sensor, which is essential for wearable sensing devices.

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“…2A), suggesting that the -NH 2 was modied on the surface of the GO (ref. 29 According to the reported literature, 31 the -NH 2 could be successfully connected to the surface of MWCNT-COOH through the condensation reaction between -NH 2 in EDA and -COOH in MWCNT-COOH, and the use of DCC could promote the reaction. 29 According to the reported literature, 31 the -NH 2 could be successfully connected to the surface of MWCNT-COOH through the condensation reaction between -NH 2 in EDA and -COOH in MWCNT-COOH, and the use of DCC could promote the reaction.…”

Section: Characterization Of Nh 2 -Gss and Pdpt Nanocages/ Mwcnt-nhmentioning

confidence: 99%

An ultrasensitive electrochemical immunosensor for CEA using MWCNT-NH₂ supported PdPt nanocages as labels for signal amplification

Wang

Cao

et al. 2015

J. Mater. Chem. B

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The excellent catalytic activity of a novel nanomaterial was introduced to ultrasensitive sandwich-type electrochemical immunosensor applications for detection of carcinoembryonic antigen (CEA). Aminofunctionalized multi-walled carbon nanotube (MWCNT-NH 2 ) supported PdPt nanocages were used as catalytic labels of secondary anti-CEA. PdPt nanocages with hollow interiors and porous walls could efficiently enhance electrocatalysis for reduction of H 2 O 2 . Meanwhile, with good dispersion, large specific surface area and amino groups, MWCNT-NH 2 can immobilize a large amount of PdPt nanocages to improve the sensitivity and amplify the signal of the immunosensor. For the immobilization of primary antibodies, 3-aminopropyltriethoxysilane functionalized graphene sheets were used as transducing materials to modify glassy carbon electrodes and to enhance the electron transfer efficiently. Under the optimal conditions, the electrochemical immunosensor exhibited a wide linear range of 0.001-20 ng mL À1 with a low detection limit of 0.2 pg mL À1 for CEA. The proposed sensing strategy enriches electrochemical immunoassays and may have a promising application in bioassay analysis.

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Unprecedented high plasmonic sensitivity of substrates based on gold nanoparticles

Cited by 25 publications

References 37 publications

Plasmonic device based on a PAAm hydrogel/gold nanoparticles composite

Plasmonic device based on a PAAm hydrogel/gold nanoparticles composite

Solution‐Processed Large‐Area Gold Nanocheckerboard Metasurfaces on Flexible Plastics for Plasmonic Biomolecular Sensing

An ultrasensitive electrochemical immunosensor for CEA using MWCNT-NH₂ supported PdPt nanocages as labels for signal amplification

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Unprecedented high plasmonic sensitivity of substrates based on gold nanoparticles

Cited by 25 publications

References 37 publications

Plasmonic device based on a PAAm hydrogel/gold nanoparticles composite

Plasmonic device based on a PAAm hydrogel/gold nanoparticles composite

Solution‐Processed Large‐Area Gold Nanocheckerboard Metasurfaces on Flexible Plastics for Plasmonic Biomolecular Sensing

An ultrasensitive electrochemical immunosensor for CEA using MWCNT-NH2 supported PdPt nanocages as labels for signal amplification

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An ultrasensitive electrochemical immunosensor for CEA using MWCNT-NH₂ supported PdPt nanocages as labels for signal amplification