Effect of Tetraethyl-Orthosilicate, 3-Aminopropyltriethoxysilane and Polyvinylpyrrolidone for synthesis of SiO2@Ag core-shell nanoparticles prepared by chemical reduction method

Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

In this research, silica (SiO2) and SiO2@Ag core-shell nanoparticles were synthesized by the co-precipitation method in the presence of ammonia as a reducing agent. First, the effect of different concentrations of tetraethyl orthosilicate (TEOS) as a precursor on the structural and optical properties of silica nanoparticles (SiO2) was investigated. Then, using this optimized concentration of TEOS, silica nanoparticles with silver shell were prepared by two methods (a) in the absence and (b) in presence of APTES (3-Aminopropyl triethoxysilane). The properties of SiO2@Ag core-shell nanoparticles prepared by two methods were compared and the best method was determined. For the synthesis of Ag nanoparticles, silver nitrate (AgNO3) and sodium borohydride (NaBH4) as reducing agents were used. To functionalize the surface of silica nanoparticles, 3-Aminopropyl-triethoxysilane (APTES) was added to the AgNO3 solution with polyvinyl-pyrrolidone (PVP) as a dispersant. The structural properties of silica and silica-silver core-shell nanoparticles were investigated by XRD and TEM. The average size of a silver single crystal in the core shells prepared by the two methods is about 25 nm and 14 nm, respectively. The optical absorption and bandgap were calculated for silica and SiO2@Ag core-shell nanoparticles. The results indicated that with increasing the concentration of TEOS precursor, the optical absorption of silica nanoparticles increased and their optical band gap reduced from 4.22 eV to 3.55 eV.

Language:
Persian
Published:
Journal of Progress in Physics of Applied Materials, Volume:1 Issue: 1, Dec 2021
Pages:
31 to 38
https://magiran.com/p2497128  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 1,390,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 70 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!