Novel Sensing Strategies Based on Monolayer Protected Gold Nanoparticles for the Detection of Metal Ions and Small Molecules

Ertem, Elif; Diez-Castellnou, Marta; Ong, Quy K.; Stellacci, Francesco

doi:10.1002/tcr.201700065

Cited by 10 publications

(5 citation statements)

References 41 publications

(39 reference statements)

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“…Generally, AuNPs could be stabilized by polymers [5], ligand [6], surfactant [7], and so on. The typical stabilizers of AuNPs are thiol or dithio ligands [8,9].…”

Section: Introductionmentioning

confidence: 99%

AuNPs-Based Thermoresponsive Nanoreactor as an Efficient Catalyst for the Reduction of 4-Nitrophenol

Liu

Zhu

et al. 2018

Nanomaterials

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A new AuNPs-based thermosensitive nanoreactor (SiO2@PMBA@Au@PNIPAM) was designed and prepared by stabilizing AuNPs in the layer of poly(N,N’-methylenebisacrylamide) (PMBA) and subsequent wrapping with the temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) layer. The new nanoreactor exhibited high dispersibility and stability in aqueous solution and effectively prevented the aggregation of AuNPs caused by the phase transformation of PNIPAM. The XPS and ATR-FTIR results indicated that AuNPs could be well stabilized by PMBA due to the electron transfer between the N atoms of amide groups in the PMBA and Au atoms of AuNPs. The catalytic activity and thermoresponsive property of the new nanoreactor were invested by the reduction of the environmental pollutant, 4-nitrophenol (4-NP), with NaBH4 as a reductant. It exhibited a higher catalytic activity at 20 °C and 30 °C (below LCST of PNIPAM), but an inhibited catalytic activity at 40 °C (above LCST of PNIPAM). The PNIPAM layer played a switching role in controlling the catalytic rate by altering the reaction temperature. In addition, this nanoreactor showed an easily recyclable property due to the existence of a silica core and also preserved a rather high catalytic efficiency after 16 times of recycling.

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“…Generally, AuNPs could be stabilized by polymers [5], ligand [6], surfactant [7], and so on. The typical stabilizers of AuNPs are thiol or dithio ligands [8,9].…”

Section: Introductionmentioning

confidence: 99%

AuNPs-Based Thermoresponsive Nanoreactor as an Efficient Catalyst for the Reduction of 4-Nitrophenol

Liu

Zhu

et al. 2018

Nanomaterials

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“…Hg 2+ and carboxylic groups of MPA has a strong binding affinity towards each other. 62,63 In order to investigate the interfacial surface charge transfer phenomena, the surface potential of the solid friction layer was characterized by Kelvin probe force microscopy(KPFM) as shown in Fig. 6a.…”

Section: Resultsmentioning

confidence: 99%

A Highly Sensitive Mercury Ion Sensor Based on Solid-Liquid Contact Electrification

Pal

Chatterjee

Saha

et al. 2020

ECS J. Solid State Sci. Technol.

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In recent years, triboelectric nanogenerators (TENGs) are proved to be as the prime backbone for developing a self-powered sensing system. However, solid-solid contact electrification based nanogenerators suffer mostly due to inefficient contact which poses a major bottleneck for the development of long term durable and stable nanosensors. In this regard, we have reported a strategic methodology to develop a highly sensitive mercury ion sensor based on solid-liquid contact electrification, which has prime importance for the self-powered monitoring of mercury ion due to its high health risk and environmental pollution toxicity. In this work, 3-mercaptopropionic acid (MPA) capped Au nanoparticles (NPs) are employed as the solid friction layer as well as the recognition element for mercury ion detection. In addition, volatile organic solvent acetone is utilized as the contact liquid instead of water. The developed nanosensor exhibits long term stability and contact frequency independent sensing performance compared to previously reported solid-solid triboelectric nanosensors (TENS) for mercury ion detection. The large binding affinity of Hg2+ and the carboxylic groups results in the increase of transferred charges and enhanced surface potential. It is interesting to observe that the work function reduces after the binding of Hg2+ ions onto MPA molecules, which is also favorable for electron transfer during the contact electrification process. The developed nanosensor can provide a wide linear detection range from 10 nM to 1 μM as well as a low detection limit of 10 nM. As a whole, this work demonstrates a novel paradigm for designing a rapid, low-cost, and portable self-powered sensing system for real time highly selective monitoring of mercury ion from complex environmental samples.

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“…By changing ligands in the nanoparticle capping layer, it is possible to impart different chemical selectivities and sensitivities toward target analytes or groups of target analytes. − Rotello and Bunz used cationic gold nanoparticles coated with different ammonium thiol derivatives to generate sensor arrays and polyanionic fluorescent polymers or proteins as indicators . This method was later expanded by Prins et al to sense small polyanionic molecules .…”

Section: Introductionmentioning

confidence: 99%

Molecular Features for Probing Small Amphiphilic Molecules with Self-Assembled Monolayer-Protected Nanoparticles

Posel

Posocco

2020

Langmuir

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The sensing of small molecules poses the challenge of developing devices able to discriminate between compounds that may be structurally very similar. Here, attention has been paid to the use of self-assembled monolayer (SAM)-protected gold nanoparticles since they enable a modular approach to tune single-molecule affinity and selectivity simply by changing functional moieties (i.e., covering ligands), along with multivalent molecular recognition. To date, the discovery of monolayers suitable for a specific molecular target has relied on trial-and-error approaches, with ligand chemistry being the main criterion used to modulate selectivity and sensitivity. By using molecular dynamics, we showcase that either individual molecular characteristics and/or collective features such as ligand flexibility, monolayer organization, ligand local ordering, and interfacial solvent properties can also be exploited conveniently. The knowledge of the molecular mechanisms that drive the recognition of small molecules on SAM-covered nanoparticles will critically expand our ability to manipulate and control such supramolecular systems.

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Novel Sensing Strategies Based on Monolayer Protected Gold Nanoparticles for the Detection of Metal Ions and Small Molecules

Cited by 10 publications

References 41 publications

AuNPs-Based Thermoresponsive Nanoreactor as an Efficient Catalyst for the Reduction of 4-Nitrophenol

AuNPs-Based Thermoresponsive Nanoreactor as an Efficient Catalyst for the Reduction of 4-Nitrophenol

A Highly Sensitive Mercury Ion Sensor Based on Solid-Liquid Contact Electrification

Molecular Features for Probing Small Amphiphilic Molecules with Self-Assembled Monolayer-Protected Nanoparticles

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