Sains Malaysiana 46(7)(2017): 1083–1088

http://dx.doi.org/10.17576/jsm-2017-4607-10

 

One-Pot Green Synthesis of Highly Reduced Graphene Oxide Decorated with Silver Nanoparticles

(Sintesis Mesra Alam Satu Pot oleh Grafin Oksida Terkurang Tinggi yang Dihiaskan dengan Zarah Nano Argentum)

 

NUR SUHAILI ABD AZIZ, MUHAMMAD KHAIRULLAH NOR AZMI & ABDUL MANAF HASHIM*

 

Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia,

Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Federal Territory, Malaysia

 

Diserahkan: 26 Disember 2016/Diterima: 27 Januari 2017

 

ABSTRACT

A one-pot green sonochemical process assisted by ascorbic acid as the reducing agent to produce highly reduced graphene oxide (rGO) decorated with silver nanoparticles (AgNPs) is demonstrated. A complete removal of oxygen-containing group in the GO sheets was confirmed by no observation of the peak corresponds to C-O, C=O and -OH bond. The unexpected decrease of peak intensity corresponds to sp² hybridized C=C group is explained by a so-called bond polarity effect. The peak observed at ~400 nm seems to show the presence of AgNPs and the red shifting of C=C peak to ~270 nm after the introduction of ascorbic acid indicates the formation of highly reduced GO. The increase of AgNPs size and the crumpled silk-like morphology after the introduction of ascorbic acid also indicate the aggressive reduction of both AgNPs and GO. The increase of I_D/I_G ratio after the introduction of ascorbic acid seems to indicate the increase of the number of small sp² domains, the presence of unrepaired defects and the restoration of the sp² network. This work provides the promising green sonochemical approach by utilizing non-toxic and environmental-friendly reducing agent to produce highly reduced GO decorated with AgNPs for various applications.

 

Keywords: Reduced graphene oxide; silver nanoparticle; sonochemical method

 

ABSTRAK

Proses sonokimia satu pot mesra alam yang dibantu oleh asid askorbik sebagai agen menurunan telah didemonstrasi untuk menghasilkan grafin oksida (rGO) terkurang tinggi yang dihiaskan dengan zarah nano argentum (AgNPs). Pembuangan yang lengkap bagi kumpulan yang mempunyai oksigen pada lembaran GO disahkan oleh tiadanya puncak kepunyaan C-O, C=O dan ikatan –OH. Pengurangan keamatan puncak yang mengejutkan pada kumpulan C=C sp² terhibrid dapat diterangkan oleh yang dipanggil kesan polariti ikatan. Puncak yang dilihat pada ~400 nm membuktikan kehadiran AgNPs dan peralihan ke kanan oleh puncak C=C pada ~270 nm selepas pengenalan kepada asid askorbik menunjukkan GO telah terturun dengan tinggi. Peningkatan saiz AgNPs dan morfologi seperti sutera renyuk selepas pengenalan kepada asid askorbik juga menunjukkan penurunan yang agresif pada kedua AgNPs dan GO. Peningkatan nisbah I_D/I_G selepas pengenalan kepada asid asorbik kelihatan menunjukkan peningkatan domain sp² yang kecil dengan kehadiran kecacatan yang tidak dibaiki dan pemulihan rangkaian sp2. Kertas ini memberikan pendekatan sonokimia yang mesra alam dengan pendekatan menggunakan agen pengurangan yang tidak toksik dan mesra alam sekitar untuk menghasilkan pengurangan GO yang tinggi dihiasi dengan AgNPs untuk pelbagai aplikasi.

 

Kata kunci: Kaedah sonokimia; penurunan grafin oksida; zarah nano argentum

 

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*Pengarang untuk surat-menyurat; email: abdmanaf@utm.my