Optical properties of silver nanoplates and perspectives for biomedical applications

被引:23
作者
Farooq, Sajid [1 ]
Nunes, Frederico Dias [2 ]
de Araujo, Renato Evangelista [1 ]
机构
[1] Univ Fed Pernambuco, Lab Biomed Opt & Imaging, Recife, PE, Brazil
[2] Univ Fed Pernambuco, Dept Engn Nucl, Recife, PE, Brazil
关键词
Localized surface plasmon resonance; Silver nanoplates; Sensitivity; Photodynamic therapy; SURFACE-PLASMON RESONANCE; REFRACTIVE-INDEX SENSITIVITY; METAL-ENHANCED FLUORESCENCE; SINGLET-OXYGEN GENERATION; PHOTODYNAMIC THERAPY; METHYLENE-BLUE; THERMAL THERAPY; GOLD; NANOPARTICLES; PHOTOSENSITIZERS;
D O I
10.1016/j.photonics.2018.07.001
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Silver nanoplates of triangular shapes have attractive optical extinction spectrum with multipolar resonance modes. In this work, we investigate the optical properties of Ag nanotriangles and evaluate the feasibility of using it on LSPR biosensing and on photodynamic therapy. Three dimensional finite element simulation and experimental analyses were explored on the assessment of the LSPR spectrum and spatial distribution of the electromagnetic field enhancement near metallic nanoplates, with different altitude length and thickness. Refractive index based sensitivity (406 nm/RIU) and figure of merit (2.6) values were measured for AgNPls colloids, and attributed to dipole LSPR near field enhancement at the tips of the nanostructure. It was observed that LSPR field enhancement extend for more than 18 nm from the nanoparticle surface, indicating the viability of using the nanoplates on molecular sensing. The interaction of Ag nanoplates with Methylene Blue photo sensitizer was also appraised, and a 2.2 fold metal enhanced single oxygen generation was determined. Our results indicate that Ag nanotriangles are promising candidates for biosensing and photodynamic application.
引用
收藏
页码:160 / 167
页数:8
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