SERS substrates based on opal films with gold coating

Astafurov, M.O.; Perevedentseva, E.V.; Melnik, N.N.; Baranchikov, A.E.; Dorofeev, S.G.; Ezhov, A.A.; Grigorieva, A.V.; Klimonsky, S.O.

Авторы: Astafurov Mikhail O., Perevedentseva Elena V., Melnik Nikolay N., Baranchikov Alexander E., Dorofeev Sergey G., Ezhov Alexander A., Grigorieva Anastasia V., Klimonsky Sergey O.
Журнал: Наносистемы: физика, химия, математика
Том: 15
Номер: 6
Год издания: 2024
Издательство: Университет ИТМО
Местоположение издательства: Санкт-Петербург
Первая страница: 902
Последняя страница: 909
DOI: 10.17586/2220-8054-2024-15-6-902-909
Аннотация: Substrates for Surface-Enhanced Raman Spectroscopy (SERS) were fabricated by gold sputtering onto surface of synthetic opal films and their characteristics were studied at wavelengths λ = 532 and 785 nm. Synthetic opal films were fabricated by self-assembly of spherical SiO2 particles on vertical substrates. It was found that at the concentration of the analyte methylene blue equal to 10-5 M the intensity of SERS at the wavelength of 785 nm increased with increasing amount of sputtered gold up to a certain optimal thickness exceeding 35 nm, while at the concentration of 10-6 M this dependence was not observed. It is assumed that this is due to the complex amount-dependent morphology of the sputtered gold coating and the presence of “hot spots” of different strengths. For the best samples at a wavelength of λ = 785 nm, the SERS enhancement factor was of 7·10^4 and a detection limit for methylene blue reached 3·10-7 M that exceeds the results published for similar substrates previously. The SERS parameters obtained for λ = 532 nm were less attractive, despite the additional enhancement due to this wavelength was at the edge of the photonic stop-band.
Добавил в систему: Климонский Сергей Олегович

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ПсковГУ
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ПсковГУ

SERS substrates based on opal films with gold coatingстатья Исследовательская статья

Прикрепленные файлы