Controllable synthesis, characterization and optical properties of Ag@AgCl coaxial core‐shell nanocables

Abstract

Core-shell structures often exhibit improved physical and chemical properties. Developing a relatively general, facile, and low temperature synthetic approach for core-shell structures with complex compositions is still a particularly challenging work. Here we report a general chemical conversion route to prepare high quality Ag@AgCl coaxial core-shell nanocables via the redox reaction between Ag nanowires and FeCl 3 in solution. The powder X-ray diffraction of the Ag@AgCl coaxial core-shell nanocables shows additional diffraction peaks corresponding to AgCl crystals apart from the signals from the Ag nanowire cores. Scanning electron microscopy and transmission electron microscopy images of the Ag@AgCl coaxial core-shell nanocables reveal that the Ag nanowires are coated with AgCl nanoparticles. The effect of the molar ratio of Fe:Ag on the morphology and optical absorption of the Ag@AgCl coaxial core-shell nanocables is systematically investigated. The result shows that the optical absorption of Ag nanowires decreases gradually and that of AgCl nanoparticles improves gradually with the increase of the molar ratio of Fe:Ag. The formation process of the Ag@AgCl coaxial core-shell nanocables has been discussed in detail. The present chemical conversion approach is expected to be employed in a broad range of applications to fabricate innovative core-shell structures with different compositions and shapes for unique properties.

Core–Shell Nanocables Decorated with Carbon Spherical Shells and Silver Nanoparticles for Sensing Ethinylestradiol Hormone in Water Sources and Pills

“…The core–shell structure of Ag@C NCs prevents Ag aggregation since organic molecules stabilize the silver nucleus. , Another contribution in this work is related to the green hydrothermal synthesis of CSSs, NCs, and AgNPs. Indeed, previous fabrication methods for Ag@C NCs are time-consuming and complex, and they are based on hard templates and organic agents to direct anisotropic growth, such as surfactants and polymers. − Our method for preparing NC/CSS/AgNPs addresses the limitations of traditional methods by using a simple and fast hydrothermal route, eliminating the need for hard templates, surfactants, and polymers. ,, The sensor involving an NC/CSS/AgNP composite deposited on screen-printed electrodes developed in this work was used to detect ethinylestradiol with minimal effects from interferents even in tap water.…”

“…31−33 Our method for preparing NC/CSS/AgNPs addresses the limitations of traditional methods by using a simple and fast hydrothermal route, eliminating the need for hard templates, surfactants, and polymers. 29,34,35 The sensor involving an NC/CSS/AgNP composite deposited on screenprinted electrodes developed in this work was used to detect ethinylestradiol with minimal effects from interferents even in tap water.…”

Desenvolvimento de dispositivos eletroquímicos baseados em nanoestruturas de carbono e prata para a detecção de interferentes endócrinos em amostras de água de abastecimento

“…Ainda assim, os protocolos hidrotermais existentes exigem tempos elevados de reação, com moldes rígidos e agentes orgânicos para direcionar o crescimento anisotrópico, como surfactantes e polímeros (TETSUMOTO; GOTOH; ISHIWATARI, 2011) (WANG et al, 2006). A presença de agentes orgânicos nestes protocolos é uma limitação, pois, estas substâncias não são totalmente eliminadas na lavagem do material podendo influenciar e atuar como interferentes na detecção eletroquímica (MAO et al, 2012) , (LI et al, 2010) , (MA et al, 2006). Devido a essas limitações, a preparação e a aplicação dos nanocabos especialmente como sensor eletroquímico permanecem inexploradas na literatura (LIU et al, 2018).…”