Combined experimental and simulation study of self-assembly of colloidal gold nanoparticles on silanized glass

Thomas, Neethu; Sreekeerthi, Pamula; Swaminathan, Parasuraman

doi:10.1039/d2cp01004f

Cited by 4 publications

(4 citation statements)

References 57 publications

(104 reference statements)

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“…The APTMS-functionalized porous TiO 2 ceramic was immersed in an aqueous AuNPS dispersion for a duration of 24 h. The color of the TiO 2 support after AuNP decoration as shown in Figure S8b was observed to change from white to pink. This suggested the possibility of deposition of negatively charged citrate-stabilized AuNPs on the porous ceramic due to electrostatic attraction with the positively charged amine groups on APTMS . The decoration of AuNPs on the TiO 2 support was also evident in the microstructure imaged by SEM and the composition analysis by elemental mapping techniques.…”

Section: Resultsmentioning

confidence: 87%

“…This suggested the possibility of deposition of negatively charged citrate-stabilized AuNPs on the porous ceramic due to electrostatic attraction with the positively charged amine groups on APTMS. 46 The decoration of AuNPs on the TiO 2 support was also evident in the microstructure imaged by SEM and the composition analysis by elemental mapping techniques. Figure S8c in the Supporting Information and a high magnification SEM image in Figure 9a showed the presence of a spherical macroporous structure decorated with AuNPs.…”

Section: Influence Of Various Parameters On Rheology Of Emulsionsmentioning

confidence: 88%

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Porous Ceramics Prepared from 3D Printed Pickering Emulsions as Gold Nanoparticle Supports for Reduction Reactions

Madhavan,

Mukherjee,

Basavaraj

2023

ACS Appl. Nano Mater.

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We present a facile method to fabricate a porous ceramic material by combining Pickering emulsion templating and direct ink writing-based three-dimensional (3D) printing. The Pickering emulsions stabilized by a binary mixture of fumed oxide particles, fractal-like aggregates of nanospheres, and polyelectrolytes were used as ink for direct ink writing. The ability of particle−polyelectrolyte complexes to adsorb at the oil− water interface was exploited for the design of printable emulsions. A control over the microstructure and rheology of the Pickering emulsion was modulated by tuning the emulsion formulation parameters such as the aqueous phase pH and concentration. The optimal conditions for the successful 3D printing of designs with excellent shape retention and structural integrity were identified by combining 3D printing experiments and detailed rheological studies. The grid-like architecture produced by 3D printing of optimal formulation was further dried and sintered to prepare an emulsion-templated porous TiO 2 ceramic. The microstructure and pore characteristics of the resultant ceramic were investigated. Finally, the use of this porous ceramic as a support for immobilizing gold nanoparticles on the surface of the porous ceramic for application in catalysis was demonstrated; as an application, the effectiveness of this gold nanoparticle-loaded porous support was illustrated by harnessing its catalytic activity for efficient reduction of 4nitrophenol, a common chemical pollutant in wastewater. The proposed Pickering emulsion-based ink system stabilized by fractallike aggregates of TiO 2 nanoparticles offers great flexibility in terms of 3D shaping and microstructure control and has good potential for developing functional ceramics of hierarchically porous structures for various applications.

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Section: Resultsmentioning

confidence: 87%

Section: Influence Of Various Parameters On Rheology Of Emulsionsmentioning

confidence: 88%

Porous Ceramics Prepared from 3D Printed Pickering Emulsions as Gold Nanoparticle Supports for Reduction Reactions

Madhavan,

Mukherjee,

Basavaraj

2023

ACS Appl. Nano Mater.

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“…This simple yet analytically strategic mechanism for nanoparticle attachment based on surface functionalization is widely employed for constructing optical and electrochemical-based biosensors and sensors today, [48][49][50][51] among other relevant applications. [52][53][54] In the case of this study, thiol groups chemically bonded to the glass support have been used to enable the selective capture of gold and silver nanoparticles on the surface support, as shown in Fig. 5, by interaction with the terminal sulydryl (-SH) functional groups in thiol (R-SH) groups on the surface of the designed support.…”

Section: Au-np and Ag-np Characterization And Their Interaction With ...mentioning

confidence: 99%

A chemically functionalized glass support for gold and silver metallic nanoparticle analysis with LIBS

Cárdenas-Escudero,

Gardette,

Villalonga

et al. 2024

J. Anal. At. Spectrom.

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“…The latter consisted of 30 nm diameter AuNPs densely packed on a glass substrate (300 ± 20 AuNPs per μm 2 ) via the electrostatic selfassembly technique. [28,29] The AuNPs were functionalized using the photochemical immobilization technique (PIT), a method developed by our research group. [30,31] This technique relies on the selective UV activation of antibodies (Abs) and is characterized by its rapid, user-friendly nature.…”

Section: Introductionmentioning

confidence: 99%

Beyond the Passive Diffusion: Core@Satellite Magneto‐Plasmonic Particles for Rapid and Sensitive Colorimetric Immunosensor Response

De Luca,

Acunzo,

Marra

et al. 2024

Advanced Sensor Research

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Magneto‐plasmonic particles, comprising gold and iron oxide, exhibit substantial potential for biosensing applications due to their distinct properties. Gold nanoparticles (AuNPs) provide plasmonic features, while iron oxide composites, responsive to an external magnetic field, significantly reduce detection time compared to passive diffusion. This study explores core@satellite magneto‐plasmonic particles (CSMPs), featuring magnetic nanoparticle clusters and numerous satellite‐like AuNPs, to amplify the optical response on a nanostructured gold surface. Using a sandwich scheme, target analytes are detected as hybrid nanoparticles bind to the pre‐immobilized target on the AuNPs surface, inducing changes in the immunosensor's extinction spectrum. Application of an external magnetic field notably enhances biosensor response and sensitivity, reducing assay time from hours to minutes. Leveraging the properties of CSMPs, the immunosensor detects specific immune protein at low concentrations within minutes. CSMPs hold considerable promise for precise and sensitive analyte detection, offering potential applications in rapid testing and mass screening.

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Combined experimental and simulation study of self-assembly of colloidal gold nanoparticles on silanized glass

Abstract: Understanding the kinetics of metal nanoparticle self-assembly on functionalized surfaces is key for a variety of applications. In this work, we present a combined experimental and Monte Carlo simulation analysis...

Cited by 4 publications

References 57 publications

Porous Ceramics Prepared from 3D Printed Pickering Emulsions as Gold Nanoparticle Supports for Reduction Reactions

Porous Ceramics Prepared from 3D Printed Pickering Emulsions as Gold Nanoparticle Supports for Reduction Reactions

A chemically functionalized glass support for gold and silver metallic nanoparticle analysis with LIBS

Beyond the Passive Diffusion: Core@Satellite Magneto‐Plasmonic Particles for Rapid and Sensitive Colorimetric Immunosensor Response

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