Tailoring the surface potential of gold nanoparticles with self-assembled monolayers with mixed functional groups

Lin, Yao; Yu, Bang-Ying; Lin, Wei–Chun; Lee, Szu-Hsian; Kuo, Chung Yen; Shyue, Jing‐Jong

doi:10.1016/j.jcis.2009.08.014

Cited by 57 publications

(44 citation statements)

References 22 publications

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“…SAMs provide a simple and well-studied method of immobilizing gold nanoparticles and enzymes onto electrodes, allowing a high degree of control of the composition and thickness of the transducer surface [32]. Colloidal gold-modified electrodes can be prepared by covalently tethering the gold nanoparticles with surface functional groups (–CN, –NH 2 , or –SH) of SAMs-modified electrode surface; alkanethiols are the most intensely studied.…”

Section: Gold Nanoparticles (Gnps)mentioning

confidence: 99%

Immobilization Techniques in the Fabrication of Nanomaterial-Based Electrochemical Biosensors: A Review

Putzbach

Ronkainen

2013

Sensors

412

252

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The evolution of 1st to 3rd generation electrochemical biosensors reflects a simplification and enhancement of the transduction pathway. However, in recent years, modification of the transducer with nanomaterials has become increasingly studied and imparts many advantages. The sensitivity and overall performance of enzymatic biosensors has improved tremendously as a result of incorporating nanomaterials in their fabrication. Given the unique and favorable qualities of gold nanoparticles, graphene and carbon nanotubes as applied to electrochemical biosensors, a consolidated survey of the different methods of nanomaterial immobilization on transducer surfaces and enzyme immobilization on these species is beneficial and timely. This review encompasses modification of enzymatic biosensors with gold nanoparticles, carbon nanotubes, and graphene.

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Section: Gold Nanoparticles (Gnps)mentioning

confidence: 99%

Immobilization Techniques in the Fabrication of Nanomaterial-Based Electrochemical Biosensors: A Review

Putzbach

Ronkainen

2013

Sensors

412

252

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“…Au nanoparticles modified by SAMs with mixed carboxylic acid and amine functional groups were developed by Shyue et al [93]. Based on electrostatic interactions, molecules could be triggered to adsorb/desorb by changing the environmental pH around the tunable isoelectric point (IEP) of the nanoparticles (between 3.2 and 7.3).…”

Section: Multifunctional Gold Nanoparticlesmentioning

confidence: 99%

Multifunctional nanoparticles: Analytical prospects

Dios

Dı́az-Garcı́a

2010

Analytica Chimica Acta

257

102

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Multifunctional nanoparticles are among the most exciting nanomaterials with promising applications in analytical chemistry. These applications include (bio)sensing, (bio)assays, catalysis and separations. Although most of these applications are based on the magnetic, optical and electrochemical properties of multifunctional nanoparticles, other aspects such as the synergistic effect of the functional groups and the amplification effect associated with the nanoscale dimension have also been observed. Considering not only the nature of the raw material but also the shape, there is a huge variety of nanoparticles. In this review only magnetic, quantum dots, gold nanoparticles, carbon and inorganic nanotubes as well as silica, titania and gadolinium oxide nanoparticles are addressed. This review presents a narrative summary on the use of multifunctional nanoparticles for analytical applications, along with a discussion on some critical challenges existing in the field and possible solutions that have been or are being developed to overcome these challenges.

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“…These readily form strong covalent Ag-S or Au-S bonds at room temperature, which attach them to the particles' surfaces. For example, attachment of amino-terminated alkane thiols can switch the ζ potential of citrate-reduced Au particles from strongly negative to strongly positive values [33]. Alternatively, it has been shown that it is possible to tune the ζ potential of Ag and Au particles by changing pH [34,35].…”

Section: Selectivitymentioning

confidence: 99%

Quantitative SERS Methods

Bell¹,

Stewart²

2010

Surface Enhanced Raman Spectroscopy

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The goal of transforming SERS from an interesting novelty into a viable quantitative analytical technique has been pursued for many years, but it is only recently that the first indications that quantitative SERS could be generally achievable have appeared. Up to this point, the challenges of preparing sensitive and reproducible enhancing media and the need to develop a deep understanding of the fundamental mechanisms of the effect (or at least to have a working knowledge of the relationship between the microstructure of the enhancing materials, their surface chemistry and the enhancements that they provide; see also Chapter 1) have been sufficient to occupy the attention of researchers who were interested in using SERS for quantitative measurements. However, many of these issues have now either been fully resolved or at least brought to the stage where they are no longer impediments. For example, new generations of enhancing media have been developed; the links between microstructure, plasmon resonances and enhancements have been established; and the role of the media's surface chemistry is being addressed. This chapter discusses these new developments and also considers the extent to which the separate strands can be combined to create standard, generally applicable methods for quantitative SERS. In addition, it highlights the need to begin the process of judging the success of new SERS methods against competing technologies, rather than against previous SERS results. SERS MediaThe choice of enhancing media for SERS studies has grown to an extraordinary extent, although they can still be broadly divided into solution-phase suspensions of nanoparticles and micro-textured solid substrates. This division dates back to the earliest work in the area, which used either colloidal suspensions of silver or gold nanoparticles [1] or the surfaces of roughened noble-metal electrodes [2]. Since this

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Tailoring the surface potential of gold nanoparticles with self-assembled monolayers with mixed functional groups

Cited by 57 publications

References 22 publications

Immobilization Techniques in the Fabrication of Nanomaterial-Based Electrochemical Biosensors: A Review

Immobilization Techniques in the Fabrication of Nanomaterial-Based Electrochemical Biosensors: A Review

Multifunctional nanoparticles: Analytical prospects

Quantitative SERS Methods

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