Role of hydrodynamic size in colloidal and optical stability of plasmonic Copper nanoparticles

Micro & nano letters

article

Purnima Sharma¹  Dinesh Goyal¹  Bhupendra Chudasama² 

[1] Department of Biotechnology, Thapar Institute of Engineering and Technology;School of Physics and Materials Science, Thapar Institute of Engineering and Technology

关键词: colloids;    aggregation;    copper;    surface plasmon resonance;    plasmonics;    nanoparticles;    nanofabrication;    ageing;    hydrodynamics;    optical stability;    plasmonic CNPs;    metallic nanoparticles;    dielectric medium;    plasmonic nanostructures;    strong plasmon excitation;    plasmonic sensors;    surface plasmon resonance;    plasmonic performance;    aggregation-induced microstructural changes;    enhanced hydrodynamic size;    colloidal stability;    wet chemical method;    Cu;   

DOI  :  10.1049/mnl.2019.0145

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Metallic nanoparticles (NPs) exhibit interesting plasmonic characteristics that depend on their size, shape and dielectric medium. Any change in these parameters can lead to significant alternation in plasmonic behaviour of NPs. Plasmonic nanostructures are prepared by wet chemical approaches, which produce NPs with a moderate yield. Amongst plasmonic class of NPs, gold and silver are widely explored in sensors because of their strong plasmon excitation. Copper NPs (CNPs) are gaining increasing attention in plasmonic sensors because of its economic advantages over silver and gold. However, major limitations of these nanostructures are their low yield and poor colloidal stability. In this Letter, authors report scale up of CNPs yield by 100% and studied their colloidal stability in terms of changes in hydrodynamic size and its influence on surface plasmon resonance (SPR). It has been observed that SPR of CNPs is independent of their yield. A gradual decrease in SPR is observed with ageing. This can be attributed to the aggregation-induced microstructural changes in the dispersion. CNPs irrespective of their yield are stable up to 180 days beyond which they lose their colloidal stability and plasmonic properties. Loss of colloidal and plasmonic characteristics of CNPs can be attributed to enhanced hydrodynamic size.

【 授权许可】

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