Gold nanocrystals: optical properties, fine-tuning of the shape, and biomedical applications

Abstract

The present review focuses on the properties and preparation of Au NCs with different morphologies as well as their important applications in biological detection.

Fe Single-Atom Carbon Dots Nanozyme Collaborated with Nucleic Acid Exonuclease III-Driven DNA Walker Cascade Amplification Strategy for Circulating Tumor DNA Detection

“…Reduced graphene oxide (rGO) is a honeycomb-arranged two-dimensional membrane construction derived through the graphene oxide (GO) as a substrate material . It has better electrical conductivity, favoring the responsiveness of the transducer. , In recent years, gold nanocrystals have received growing attention in medical and biosensing research owing to their exceptional physicochemical properties and biological affinity. − Among them, gold nanoparticles (AuNPs) are the commonest accessory elements in nanohybridized biosensors that not only immobilize a vast quantity of identifying elements, biomolecules, but also expedite the speed of electron transport at the face of the poles . Hence, the combination of rGO and AuNPs collectively strengthens the sensitivity and stability of the sensing electrodes.…”

Novel Au/Cu2NiSnS4 Nano-Heterostructure: Synthesis, Structure, Heterojunction Band Offset and Alignment, and Interfacial Charge Transfer Dynamics

“…15 Au is observed in the visible part of the spectrum and is typically stable (thermodynamically and kinetically) under harsh conditions. 16 It has been proposed that on coupling metallic Au with CQCs, the Au core absorbs photons and transfers the absorbed energy to the CQCs via dipole−dipole coupling known as plasmon resonance energy transfer (PRET). 17 These hetero-nanostructures offer a synergistic effect of optical absorption, forming type II heterojunctions that strongly influence the carrier transport properties and lead to the spatial separation of photoexcitons by reducing their recombination.…”

Understanding Metal–Semiconductor Plasmonic Resonance Coupling through Surface-Enhanced Raman Scattering

“…Surface plasmon resonance (SPR) is the light-induced collective oscillation of conduction band electrons in metal nanoparticles, which has tremendous impacts on chemistry. , SPR allows the direct conversion of photons into highly energetic electrons, i.e., hot electrons, and its sequential transfer from metal to contacting molecules/semiconductors facilitates a series of fields, especially photovoltaics, photocatalyses, and photodetectors. , Tuning the SPR band of metal nanomaterials is crucial for their applications, which can be realized by controlling the nanoparticles’ morphology, surface properties, and so on. , …”

“…3,4 Tuning the SPR band of metal nanomaterials is crucial for their applications, which can be realized by controlling the nanoparticles' morphology, surface properties, and so on. 5,6 Heterostructures consisting of metal and semiconductor nanoparticles have been widely used. 7,8 Monolayer MoS 2 -Ag nanoparticles have excellent applications in surface catalysis due to stronger coupling and higher energy transfer rates between the plasmon of the Ag NPs and the excitons of the MoS 2 .…”