کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7835099 | 1503531 | 2018 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ultra-high sensitive substrates for surface enhanced Raman scattering, made of 3â¯nm gold nanoparticles embedded on SiO2 nanospheres
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The surface properties of substrates made of 3â¯nm gold nanoparticles embedded on SiO2 nanospheres enabled fingerprint detection of thiabendazole (TBZ), crystal violet (CV) and 4-Aminothiophenol (4-ATP) at an ultralow concentration of â¼10â18â¯M by surface enhanced Raman spectroscopy (SERS). Gold nanoparticles of an average size of â¼3â¯nm were synthesized and simultaneously embedded on SiO2 nanospheres by the electron irradiation method. The substrates made from the 3â¯nm gold nanoparticles embedded on SiO2 nanospheres were successfully used for recording fingerprint SERS spectra of TBZ, CV and 4-ATP over a wide range of concentrations from 10â6â¯M to 10â18â¯M using 785â¯nm laser. The unique features of these substrates are roughness near the surface due to the inherent structural defects of 3â¯nm gold nanoparticles, nanogaps ofâ¯â¤â¯1â¯nm between the embedded nanoparticles and their high number. These produced an abundance of nanocavities which act as active centers of hot-spots and provided a high electric field at the reporter molecules and thus an enhancement factor required to record the SERS spectra at ultra low concentration of 10â18â¯M. The SERS spectra recorded by the substrates of 4â¯nm and 6â¯nm gold nanoparticles are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 441, 31 May 2018, Pages 744-753
Journal: Applied Surface Science - Volume 441, 31 May 2018, Pages 744-753
نویسندگان
A.B. Phatangare, S.D. Dhole, S.S. Dahiwale, V.N. Bhoraskar,