Malaysian Journal of Analytical Sciences Vol 26 No 2 (2022): 202 - 214

 

 

 

 

OPTIMIZATION PARAMETERS FOR ELECTROPOLYMERIZATION OF MELAMINE IN DEEP EUTECTIC SOLVENT

 

(Pengoptimuman Parameter Elektropempolimeran Melamin Dalam Pelarut Eutektik Dalam)

 

Yeet Hoong Chang¹, Pei Meng Woi^1,2*, Yatimah Alias^1,2

 

¹Department of Chemistry, Faculty of Science

²University Malaya Centre for Ionic Liquids (UMCiL)

University of Malaya, 50603 Kuala Lumpur, Malaysia

 

*Corresponding author:  pmwoi@um.edu.my

 

 

Received: 15 September 2021; Accepted:  10 December 2021; Published:  28 April 2022

 

 

Abstract

Polymelamine is a new class of polymer that possess electrocatalytic behavior in dopamine (DA) detection. Our previous studies have successfully replaced the conventional acidic electrolyte to deep eutectic solvent (DES) has open the opportunity for a greener solvent in used. Herein we report the optimization process of melamine electropolymerize in DES- reline. Various electrochemical techniques have been employed to studies the ideal parameters. The optimum potential window, scan rate, and number of scan cycles were recorded as -0.20 V – 1.60 V,  50 mV s^-1 and five scan cycles, respectively. Cyclic voltammetry (CV) was employed in the electropolymerization of melamine to optimize the redox behavior of polymelamine film on electrode surface. The growing of polymer film which indicated by the increased of reduction current can be well-controlled by the slow scan rate and optimum scan cycles which leads to strong adhesion and uniform morphology. Amperometry sensing on DA was performed to study and compare the sensitivity and limit of detection for the polymers synthesized in varied parameters. A brief discussion on the principal polymerization factors that would affecting the electrocatalytic behavior of melamine is included.

 

Keywords:  deep eutectic solvent, electropolymerization, melamine, optimization

 

Abstrak

Polimelamin adalah kelas polimer baharu yang mempunyai tingkah laku elektromangkin dalam pengesanan dopamin (DA). Kajian yang dilaporkan terdahulu menujukkan kerjayaan penggantian elektrolit berasid konvensional kepada pelarut eutektik (DES). Kejayaan ini membuka peluang untuk pelarut yang lebih mesra alam digunakan. Dengan ini, kami melaporkan proses pengoptimum elektropolimerisasi melamin dalam DES-relin. Pelbagai teknik elektrokimia telah digunakan untuk mengkaji parameter yang terbaik. Julat keupayaan, kadar imbasan dan bilangan kitaran imbasan yang terbaik dicatat pada -0.20 V – 1.60 V, 50 mVs^-1 dan lima kitaran imbasan. Siklik voltametri (CV) telah digunakan dalam elektropolimerisasi melamin untuk mengoptimumkan tingkah laku elektropemangkinan lapisan polimelamin pada permukaan elektrod. Pertumbuhan lapisan polimer yang ditunjukkan dalam penainkkan arus penurunan boleh dikawal baik dengan kadar imbasan yang perlahan dan kitaran imbasan optimum untuk mencapai lekatan yang kuat dan morfologi yang seragam. Penderiaan amperometri pada DA telah dijalankan untuk mengkaji dan membandingkan kepekaan dan had pengesanan rendah untuk polimer yang disintesis dalam parameter yang berbeza-beza. Perbincangan ringkas tentang faktor-faktor elektropolimerisasi yang mempengaruhi tingkah laku elektromangkin melamin telah disertakan.

 

Kata Kunci:  pelarut eutektik dalam, elektropempolimeran, melamin, pengoptimuman

 

Graphical Abstract

 

 

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