Open AccessDetection of Ultra-Low Concentration of Methylene Blue by Porous Silicon Photonic Crystals Covered With Siver Nanoparticles as Efficient Sers Substrate
Author(s) -
Chinh Duc Vu,
Thuy Van Nguyen,
Thanh Binh Pham,
Van Hoi Pham,
Huy Bui,
Thi Hong Hanh Vu,
Pham Viet Hai
Publication year - 2021
Publication title -
communications in physics/communications in physics
Language(s) - English
Resource type - Journals
eISSN - 2815-5947
pISSN - 0868-3166
DOI - 10.15625/0868-3166/15927
Subject(s) - porous silicon , substrate (aquarium) , methylene blue , raman scattering , materials science , detection limit , silicon , nanoparticle , raman spectroscopy , photonics , silver nanoparticle , analytical chemistry (journal) , nanotechnology , optoelectronics , optics , chemistry , chromatography , organic chemistry , photocatalysis , oceanography , physics , geology , catalysis
In this work, porous silicon photonic crystals (PSi PhCs) covered by silver nanoparticles (AgNPs) were prepared as surface-enhanced Raman scattering (SERS) substrate to detect methylene blue (MB) at low concentrations. The limit of MB detection in water by the SERS substrate is evaluated to be 10\(^{-10}\) mol/L. The SERS signal intensities of 446 cm\(^{-1}\) and 1623 cm\(^{-1}\) peaks in SERS spectra of MB are fit in exponential functions of concentrations ranging from 10\(^{-4}\) to 10\(^{-10}\) mol/L. These results show that the AgNPs on PSi PhCs substrates could be applied in environmental sensing.