Malaysian Journal of Analytical Sciences Vol 23 No 2 (2019): 290 - 299

SYNTHESIS AND CHARACTERIZATION OF SILICA-SILVER CORE-SHELL NANOPARTICLES

(Sintesis dan Pencirian Silika-Perak Nanopartikel Teras-Cengkerang)

Nur Kamilah Mohd, Wan Mohd Afiq Wan Mohd Khalik, Alyza A. Azmi*

School of Marine and Environmental Sciences,

Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia

*Corresponding author: alyza.azzura@umt.edu.my

Received: 10 February 2019; Accepted: 30 March 2019

Abstract

Silica-silver core-shell nanoparticles have received tremendous interests in various applications compared to the bare silver nanoparticles due to several important features such as exhibit higher surface area, the existence of a synergistic effect between the core and the shell, stabilize silver nanoparticles against aggregation, and easily control their properties by the changing shell structure and shell geometry. Due to this significance, this study was conducted to synthesis and characterization of silica-silver core-shell nanoparticles using the facile method without any surface modification needed. In the synthesis route, silica particles have been synthesis based on the Stӧber method. The deposition of nanoscales silver layer on silica surface mainly involves the electrostatic attraction between [Ag(NH₃)₂]⁺ions and silanol groups, and the addition of polyvinylpyrrolidone (PVP) has been acted as a reducing agent and stabilizing agent. UV-Vis spectroscopy evidenced the absorption of surface plasmon resonance (SPR) of silver nanoparticles in the range 380-450 nm. The crystallinity of silica-silver core-shell nanoparticles showed the face-centered cubic (fcc) structure by X-ray powder diffraction (XRD) analysis. The spherical shape of silica particles with an average 200-220 nm in size has been determined using scanning electron microscope (SEM). The high resolution-transmission electron microscope (HR-TEM) images visualized the successful formation of spherical silver nanoparticles on the silica surface with the average of size 10-40 nm. X-ray photoelectron spectroscopy analysis revealed the elemental compositions exist in the silica-silver core-shell nanoparticles. The synthesized silica-silver core-shell nanoparticles will be used as a potential catalyst in dye treatment application in the future work.

Keywords: core-shell, nanoparticles, silica-silver core-shell, deposited, Stӧber method

Abstrak

Silika-perak nanopartikel teras-cengkerang telah menarik minat yang besar dalam pelbagai aplikasi berbanding dengan nanopartikel perak disebabkan oleh beberapa kelebihan seperti permukaan kawasannya lebih tinggi, kewujudan kesan sinergi di antara teras dan cengkerang, mengelakkan pengumpulan nanopartikel perak dan memudahkan untuk mengawal ciri-ciri yang dikendaki dalam nanopartikel teras-cengkerang dengan mengubah morfologi dan geometri partikel cengkerang. Sintesis dan pencirian silika-perak nanopartikel teras-cengkerang telah dilakukan tanpa sebarang pengubahsuaian terhadap permukaan partikel. Proses sintesis melibatkan penghasilan zarah silika menggunakan kaedah Stӧber. Pemendapan lapisan perak nano pada permukaan silika melibatkan tarikan elektrostatik antara kumpulan ion [Ag(NH₃)₂]⁺ dan kumpulan silanol, dan penambahan polivinilpirolidon (PVP) akan bertindak sebagai agen penurunan dan agen penstabilan. Pencirian silika-perak nanopartikel teras-cengkerang menggunakan spektroskopi ultra lembayung tampak (UV-Vis) telah menunjukkan penyerapan resonansi plasmon permukaan (SPR) nanopartikel perak dalam lingkungan 380 - 450 nm. Kehabluran silika-perak nanopartikel teras-cengkerang menunjukkan struktur berpusatkan kubik berpusat (fcc) dengan menggunakan pembelauan sinar-X (XRD). Zarah silika berbentuk sfera dengan saiz 200 nm ditentukan dengan menggunakan mikroskop imbasan elektron (SEM). Saiz perak yang telah didepositkan pada permukaan silika telah diukur menggunakan mikroskop transmisi elektron beresolusi tinggi (HR-TEM) dengan ukuran 10-40 nm. Analisis spektrometer fotoelektron sinar-X (XPS) telah mendedahkan komposisi unsur yang ada di dalam silika-perak nanopartikel teras-cengkerang. Nanopartikel teras-petala silika-perak akan digunakan sebagai potensi rawatan pewarna pada masa akan datang.

Kata kunci: teras-cengkerang, nanopartikel, silika-perak nanopartikel teras-cengkerang, deposit, kaedah Stӧber

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