New Gold Nanostructures for Sensor Applications: A Review

Zhang, Yuanchao; Chu, Wendy; Foroushani, Alireza; Wang, Hongbin; Li, Da; Liu, Jingquan; Barrow, Colin J.; Wang, Xin; Yang, Wenrong

doi:10.3390/ma7075169

Cited by 181 publications

(103 citation statements)

References 122 publications

(164 reference statements)

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“…Moreover, CNFs prevent self-aggregation of GNPs, which determine an enhancement in accessible sites of nanocomposite. 43,44 Therefore, it can be concluded that CNFs and GNPs have synergistic effects.…”

Section: Results and Discussion Electrochemical Properties Of Cnf-gnpmentioning

confidence: 99%

“…43 At the same time, gold nanoparticles (GNPs) have also been shown to display great conductivity, enhanced electrocatalytic activity and biocompatibility. 44 Therefore, it can be expected that a synergistic effect of both CNFs and GNPs (CNF-GNP) together can lead to a highly sensitive voltamperometric sensor for the determination of pyritinol.…”

Section: Introductionmentioning

confidence: 99%

“…The GNPs show high electrocatalytic activity, which facilitates the electron transfer at the electrode surface. 43,44 Hence, the synergistic effect of CNFs and GNPs leads to a highly sensitive voltamperometric sensor for pyritinol. A simple and sensitive voltammetric method was developed using these results.…”

mentioning

confidence: 99%

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Highly sensitive voltamperometric determination of pyritinol using carbon nanofiber/gold nanoparticle composite screen-printed carbon electrode

Apetrei¹,

Apetrei

2017

IJN

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A novel and highly sensitive electrochemical method for the detection of pyritinol in pharmaceutical products and serum samples has been accomplished based on voltamperometric response of pyritinol in carbon nanofiber-gold nanoparticle (CNF-GNP)-modified screen-printed carbon electrode (SPCE). The electrochemical response of pyritinol to CNF-GNP-modified SPCE was studied by cyclic voltammetry and square-wave voltammetry (SWV). Under optimized working conditions, the novel sensor shows excellent voltamperometric response toward pyritinol. The SWV study shows significantly enhanced electrochemical response for pyritinol in CNF-GNP-modified SPCE providing high sensitivity to the novel sensor for pyritinol detection. The peak current for pyritinol is found to be linear with the concentration in the range 1.0×10 −8 –5.0×10 −5 M with a detection limit of 6.23×10 −9 M using SWV as the detection method. The viability of the new developed sensor for the analytical purposes was studied by performing experiments on various commercial pharmaceutical products and blood serum samples, which yielded adequate recoveries of pyritinol. The novel electrochemical sensor provides high sensitivity, enhanced selectivity, good reproducibility and practical applicability.

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Section: Results and Discussion Electrochemical Properties Of Cnf-gnpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Highly sensitive voltamperometric determination of pyritinol using carbon nanofiber/gold nanoparticle composite screen-printed carbon electrode

Apetrei¹,

Apetrei

2017

IJN

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“…Furthermore, the AuNPs deposited on the walls of the silicon in the porous matrix act as an additional source to improve the surface area and hence enhance the gas adsorption rate (Zhang and Chu 2014), while the embedded gold nanoparticle inside the pores itself will damp the activity of the pores, so the current will decrease. The relative response of the current of the (S) was calculated using the following relation:…”

Section: Electrical Characterizationmentioning

confidence: 99%

Room temperature CO2 gas sensors of AuNPs/mesoPSi hybrid structures

Alwan

Dheyab

2017

Appl Nanosci

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Mesoporous silicon (mesoPSi) layer prepared by a laser-assisted etching process in HF acid has been employed as CO 2 gas sensors. The surface morphology of mesoPSi was modified by embedding gold nanoparticles AuNPs by simple and quick dipping process in different gold salts concentrations to form mesoPSi/AuNPs hybrid structures. Morphology of hybrid structures was investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrical characteristics of the prepared gas sensor were carried out at room temperature. It was found that the nanoparticles size, shape and the specific surface area of the nanoparticle strongly influence the current-voltage characteristics. Considerable improvement was noticed in sensitivity, response and recovery times of gas sensor with decreasing incorporated AuNPs into the mesoPSi matrix.

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“…Careful selection and design of ligands strongly influence the sensitivity and selectivity of a sensor. 5,11 Gold nanoparticles can be synthesized by a citrate reduction method pioneered by Turkevich 12 and later advanced by Frens, 13 with a variety of modification's methods. 6,[14][15][16][17][18] The nanoparticle morphology is dependent upon chemical nanoparticle synthesis methods.…”

Section: -8mentioning

confidence: 99%

A Hybrid Approach to Fabricated Nanowire-Nanoparticle Composites of a Co-W Alloy and Au Nanoparticles

Vernickaite

Bubniene

Cesiulis

et al. 2016

J. Electrochem. Soc.

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Co-W nanowires were fabricated by pulsed electrodeposition from a citrate-glycine electrolyte onto rotating cylinder electrodes and into nanoporous polycarbonate membranes. The characterization of the electrodeposition conditions and alloy composition of electrodeposited Co-W alloy thin films were determined and used to guide conditions to electrodeposit the nanowires. Gold nanoparticles of 50 nm size were also added to the electrolyte and deposited during electrodeposition of the Co-W alloy nanowires, embedded within, and attached to the nanowire tip, introducing a novel procedure to attached nanoparticles onto nanowires. Nano-electrodes can be used for various sensing applications, and they can be easily integrated in micro-and nano-scale devices.1 The sensitivity of nano-electrodes depends on the diameter of electrode tip, and the highest sensitivity is observed by most electrochemical methods if the diameter of the working electrode tip is on the same order of the molecular species being detected. To this end, nano-gaping technology has been applied for the fabrication of nano-electrodes that are based on FIB and E-beam lithographic approaches, 2,3 including electrodeposition and/or chemical etching techniques. Gold-based 1D nanostructures (e.g., nanowires, gold nanoparticles) have been recognized as unique materials for electrical and optical sensing applications.5 Gold nanowires can provide high current densities, high signal to noise ratio and low double layer capacitance, 6 while surface plasmon resonance, often exploited with nanoparticles, can uniquely probe interactions of molecules at chemical surfaces and provide label-free bio detection. 5-8Gold nanoparticles (AuNPs) are excellent materials for functionalizing electrode surfaces.9,10 Functionalization can be achieved via the use of bi-functional chemical linking agents, mixing with the components of composite electrodes, covalent binding and others. Notably, gold nanoparticles alone have limited applications in sensing unless surface modification is performed. Careful selection and design of ligands strongly influence the sensitivity and selectivity of a sensor. 5,11 Gold nanoparticles can be synthesized by a citrate reduction method pioneered by Turkevich 12 and later advanced by Frens, 13 with a variety of modification's methods. 6,[14][15][16][17][18] The nanoparticle morphology is dependent upon chemical nanoparticle synthesis methods.Linking agents are typically applied in order to bind gold nanoparticles to surfaces of various substrates. 7,14,[19][20][21][22][23] Surface chemical modification and functionalization using linkers both are attractive methodologies because of highly active and selective layer formation, strong electrode intersectional binding, and changeable physical properties. However, there are a few important disadvantages if linkers are applied in order to design nano-electrodes: additional materials affect surface conductivity and can reduce it or lead to poor electrical contact, and they can shorten an electrode's applica...

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New Gold Nanostructures for Sensor Applications: A Review

Cited by 181 publications

References 122 publications

Highly sensitive voltamperometric determination of pyritinol using carbon nanofiber/gold nanoparticle composite screen-printed carbon electrode

Highly sensitive voltamperometric determination of pyritinol using carbon nanofiber/gold nanoparticle composite screen-printed carbon electrode

Room temperature CO2 gas sensors of AuNPs/mesoPSi hybrid structures

A Hybrid Approach to Fabricated Nanowire-Nanoparticle Composites of a Co-W Alloy and Au Nanoparticles

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