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Gold-carbon nanotube nanocomposites: synthesis and applications

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Abstract

Nanocomposites are combinations of nanomaterials with other molecules or nanoscaled materials, such as nanoparticles or nanotubes. In general, these novel nanocomposites have different physical and chemical properties from the constituent particles or wires, and will thus allow new kinds of applications. Among these nanocomposites, gold-carbon nanotube (Au-CNT) composites are of particular interests, due to their easy fabrication protocols and broad potential applications. Au-CNT nanocomposites commonly refer to gold nanoparticles deposited on carbon nanotubes. To obtain Au-CNT nanocomposites, different methods have been developed, including direct and linked deposition of gold nanoparticles on CNT. Au-CNT nanocomposites combine the excellent physical and chemical properties of both gold nanoparticles and carbon nanotubes. The easy modification surface of gold nanoparticle and the excellent conductivity of carbon nanotube as well the high surface area, point towards a broad range of applications, such as biosensing, gas sensing, and electrochemistry. This paper reviews the recent progress of different kinds of Au-CNT nanocomposites and their synthesis and applications. properties of nanomaterials and on the developments of instruments such as the combination of scanning probe microscopes with transmission electron microscopes.

FAQs

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What unique properties do Au-CNT nanocomposites offer compared to other materials?add

Au-CNT nanocomposites combine high conductivity and large surface area, enhancing sensor responsiveness and sensitivity. Their multifunctionality increases application potential across biosensors, optics, and medical fields.

What methods are used for the synthesis of Au-CNT nanocomposites?add

Au-CNT nanocomposites are synthesized predominantly through direct deposition methods, including both physical (e.g., thermal and electron-beam deposition) and wet chemical methods. Recent studies highlight improved methods for better uniformity of gold particles on carbon nanotubes.

What advantages do covalently linked Au-CNT nanocomposites provide?add

Covalently linked Au-CNT nanocomposites ensure stronger bonding between the gold nanoparticles and carbon nanotubes, which enhances stability under extreme conditions. Techniques such as using 2-aminoethanethiol for functionalization have yielded nanoparticles resistant to detachment.

How effective are Au-CNT nanocomposites in glucose biosensing applications?add

Recent glucose sensors based on Au-CNT nanocomposites achieved a linear range of 20 mM and detection limits down to 25 µM. This progression improves the sensitivity and operational range significantly compared to conventional sensor methods.

What are the emerging applications of Au-CNT nanocomposites beyond sensing?add

Emerging applications of Au-CNT nanocomposites include drug delivery systems and toxicant sensors, achieving low detection limits for arsenic and mercury. Their versatility also allows novel structures for fuel cells and gas storage solutions.

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