DataVXACS PhotonicsPaper
journal article·2025-07-16

Plasmonic Nanocavities with Metallic Spacer Layers for Ultrasensitive Detection of Cr6+ Ions

Xiaotian Wang, Wuliji Hasi, Shuang Lin, Siqingaowa Han, Guoqiang Fang, Xiang Lin

ACS Photonics· Volume 12· Issue 7
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Source abstract

Abstract

Plasmonic nanocavities are ideally suited for optical sensing due to their unique ability to localize and focus light on the nanoscale. However, plasmonic nanocavities formed between metallic nanoparticles on a metal film are either hydrophobic or entirely filled with nonmetallic spacer layers, hindering molecular diffusion into the hotspot regions. In this study, we designed and fabricated a plasmonic structure of multitipped Au@Ag–Au particle in nanocuboids (PCs), integrated with a metal film to create open plasmonic nanocavities. By adjusting the pH of the growth solution to control the reduction rate and the etching rate of Au 3+, we precisely regulated the selective growth of metallic nanoparticles on the surface of Au@Ag core–shell nanocuboids. This plasmonic nanocavity is spaced by metal nanoparticles and forms 5 nm cavities open to the surroundings, which results in significantly enhanced Raman performance compared to traditional plasmonic nanocavities. Finally, functionalization of this plasmonic nanocavity enabled ultrasensitive detection of Cr 6+ Ions.
Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Plasmonic and Surface Plasmon Research · Advanced biosensing and bioanalysis techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Key Laboratory of Laser Spatial Information

Harbin Institute of Technology

Zhengzhou Research Institute, Harbin Institute of Technology

Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, Liaoning Key Laboratory of Plasma Technology, School of Physics and Materials Engineering

Dalian Minzu University

Department of Combination of Mongolian Medicine and Western Medicine Stomatology

Affiliate Hospital of Inner Monggolia Minzu University

Funding

Fundamental Research Funds for the Central Universities · Project of Inner Mongolia Natural Science Foundation · Joint Funds of the Science and Technology Program of Liaoning Province · National Natural Science Foundation of China · Liaoning Revitalization Talents Program · Natural Science Foundation of Liaoning Province for Excellent Young Scholars

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