A SERS platform based on diatomite modified by gold nanoparticles using a combination of layer-by-layer assembly and a freezing-induced loading method. Issue 15 (1st April 2022)

• Record Type: Journal Article
• Authors: Cvjetinovic, Julijana; Merdalimova, Anastasiia A.; Kirsanova, Maria A.; Somov, Pavel A.; Nozdriukhin, Daniil V.; Salimon, Alexey I.; Korsunsky, Alexander M.; Gorin, Dmitry A.
• Is Part Of: Physical chemistry chemical physics. Volume 24:Issue 15(2022)
• Page Start: 8901
• Page End: 8912
• Publication Date: 2022-04-01
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d2cp00647b
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : A novel eco-friendly approach based on a combination of layer-by-layer and freezing-induced loading techniques implemented to modify diatomite using gold nanoparticles ensures surface-enhanced Raman scattering and photoacoustic signal amplification. Abstract : Siliceous diatom frustules represent an up-and-coming platform for a range of bio-assisted nanofabrication processes able to overcome the complexity and high cost of current engineering technology solutions in terms of negligibly small power consumption and environmentally friendly processing combined with unique highly porous structures and properties. Herein, the modification of diatomite – a soft, loose, and fine-grained siliceous sedimentary rock composed of the remains of fossilized diatoms – with gold nanoparticles using layer-by-layer technology in combination with a freezing-induced loading approach is demonstrated. The obtained composite structures are characterized by dynamic light scattering, extinction spectroscopy, scanning (SEM) and transmission electron microscopy (TEM), and photoacoustic imaging techniques, and tested as a platform for surface-enhanced Raman scattering (SERS) using Rhodamine 6G. SEM, TEM, and energy dispersive X-ray spectroscopy (EDX) confirmed a dense coating of gold nanoparticles with an average size of 19 nm on the surface of the diatomite and within the pores. The photoacoustic signal excited at a wavelength of 532 nm increases with increasing loading cycles of up to three polyelectrolyte-gold nanoparticle bilayers. The hybrid materials based on diatomite modified with gold nanoparticles can be used as SERS substrates, but also as biosensors, catalysts, and platforms for advanced bioimaging.