Measuring the refractive index and sub-nanometre surface functionalisation of nanoparticles in suspension

Mulkerns, Niall M C; Hoffmann, William H.; Ramos‐Soriano, Javier; Cruz, Noelia de la; Garcia-Millan, Teodoro; Harniman, Robert L.; Lindsay, I.D.; Seddon, Annela M.; Galan, M. Carmen; Gersen, Henkjan

doi:10.1039/d2nr00120a

Cited by 5 publications

(7 citation statements)

References 58 publications

(102 reference statements)

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“…The surface plasmon resonances of all four samples red-shifted with the extent of the shift related to MBA amount on the nanoparticle surface (Figure 1C−F, inset graphs), due to the change of refractive index near the nanoparticle surface. 25 The LSPR bandwidths remained essentially unchanged (Figure 1C−F), verifying that all samples maintained their colloidal stability. 26 Kinetics of Limited and Excess Amounts of MBA with AuNP and AuNS.…”

Section: ■ Results and Discussionmentioning

confidence: 60%

Shape-Induced Variations in Aromatic Thiols Adsorption on Gold Nanoparticle: A Novel Method for Accurate Evaluation of Adsorbed Molecules

Tukova,

Tavakkoli Yaraki,

Rodger

et al. 2023

Langmuir

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Nonspherical gold nanoparticles (GNPs) are increasingly used to enhance sensitivity and selectivity in analytical methods such as surface-enhanced Raman spectroscopy (SERS) for detecting trace biomarkers. However, there is limited research on the adsorption properties of aromatic thiols onto gold nanoparticles of different morphologies, where surface curvature varies significantly at the molecular level. In this study, we investigated the adsorption kinetics of 4-mercaptobenzoic acid, an aromatic molecule, on GNPs with different shapes using SERS. Our findings revealed significant differences in the adsorption behavior and binding site preferences of aromatic thiols on GNPs with distinct morphologies. While thiol molecules consider any surface site on nanospheres equally appealing, nanostars exhibit variations in curvature and surface energy, leading to initial binding with further repositioning from the tips of the nanostar after plasmon activation. To address these differences, we proposed a universal method to evaluate the quantity of tightly bound adsorbed molecules on GNPs independently of the particle size, shape, or concentration.

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Section: ■ Results and Discussionmentioning

confidence: 60%

Shape-Induced Variations in Aromatic Thiols Adsorption on Gold Nanoparticle: A Novel Method for Accurate Evaluation of Adsorbed Molecules

Tukova,

Tavakkoli Yaraki,

Rodger

et al. 2023

Langmuir

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“…Furthermore, AFM images revealed a varying morphology with a uniform glycoside shell for glucose, mannose and lactose derivatives whereas galactose and maltose coating resulted in inhomogeneous surface coverage. More recently, Mulkerns et al 136 developed a practical strategy, based on measuring the refractive index of nanoparticles, to determine the ratio of the volume of the functionalisation layer with regards to the particle volume, e.g. CDs in suspension based on refractive index mesurements.…”

Section: Glycocarbon Dots (Glycocds)mentioning

confidence: 99%

Carbon-based glyco-nanoplatforms: towards the next generation of glycan-based multivalent probes

2022

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Section: Introductionmentioning

confidence: 99%

“…The refractive index is one of the basic optical characteristics of liquid material, and it is widely used in the fields of material, chemical industry, food, medical treatment, and so on. [1][2][3] It follows that the measurement of the liquid refractive index is closely related to scientific research and industrial production and is an important research topic in modern science. Thus simple and high-precision methods on the measurement of the refractive index are required for the liquid material analysis and for its applications such as the measurement of liquid concentrations.…”

Section: Introductionmentioning

confidence: 99%

Refractive index measurement of uniform liquid using an improved laser speckle method

Luo

Yang

et al. 2023

Opt. Eng.

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Based on the refraction characteristic of uniform and transparent liquid, the measurement error of the liquid refractive index using the internal standard method is analyzed, and an improved laser speckle method is proposed. This method designs a double-cell structure composed of two identical rectangular parallelepiped glass cells with one cell containing the liquid to be measured and the other one being empty. This double-cell structure is placed in the built optical system based on laser speckle, and then the refractive indices of sodium chloride solution and sucrose solution with various concentrations are measured by the improved method. Compared with the measurement values of the Abbe refractometer and the internal standard method, the results show that the improved method can significantly reduce the measurement error and improve the measurement accuracy.

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Measuring the refractive index and sub-nanometre surface functionalisation of nanoparticles in suspension

Abstract: Direct measurements to determine the degree of surface coverage of nanoparticles by functional moieties are rare, with current strategies requiring a high level of expertise and expensive equipment. Here, a...

Cited by 5 publications

References 58 publications

Shape-Induced Variations in Aromatic Thiols Adsorption on Gold Nanoparticle: A Novel Method for Accurate Evaluation of Adsorbed Molecules

Shape-Induced Variations in Aromatic Thiols Adsorption on Gold Nanoparticle: A Novel Method for Accurate Evaluation of Adsorbed Molecules

Carbon-based glyco-nanoplatforms: towards the next generation of glycan-based multivalent probes

Refractive index measurement of uniform liquid using an improved laser speckle method

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