Enhanced Electrochemiluminescence of N-(aminobutyl)-N-(ethylisoluminol) Functionalized Gold Nanoparticles by Graphene Oxide Nanoribbons
Enhanced Electrochemiluminescence of N-(aminobutyl)-N-(ethylisoluminol) Functionalized Gold Nanoparticles by Graphene Oxide Nanoribbons
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DOI：
10.1016/j.electacta.2015.08.043
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发表时间：
2015-10
影响因子：
6.6
通讯作者：
Nur Syakimah Binti Ismail;Q. Le;Quamrul Hasan;H. Yoshikawa;M. Saito;E. Tamiya
中科院分区：
文献类型：
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作者：
Nur Syakimah Binti Ismail;Q. Le;Quamrul Hasan;H. Yoshikawa;M. Saito;E. Tamiya
在碱性条件下，研究了N-（氨基丁基）-N-（乙基异鲁米诺）功能化金纳米粒子（ABEI-AuNP）与氧化石墨烯纳米带（GONRs）的电化学发光（ECL）机理。在我们的催化体系中，GONR负载的ABEI-AuNP比未负载的ABEI-AuNP/SPE有明显的上级优势，并且表现出极大增强的ECL强度（约30.0%）。这种差异不仅归因于ABEI-AuNP-GONR/SPE的总表面积增加了80.2%，而且归因于GONR上的官能团与Au活性位点之间的金属-氧键合导致的ABEI-AuNP催化活性的增强。ABEI-AuNP的这种改进的催化活性促进氧化自由基的产生和ABEI氧化过程的快速反应动力学。为了进一步阐明循环伏安法（CV）条件下ABEI电化学发光中反峰现象的机理，考察了缓冲溶液pH值、溶解氧存在、过氧化氢浓度等因素对ABEI电化学发光的影响。将液相ABEI对裸SPE和GONR/SPE的作用机制与固相ABEI-AuNP的作用机制进行了比较，以验证所提出的ABEI-AuNP-GONR/SPE的作用机制。
The mechanism of electrochemiluminescence (ECL) of anN-(aminobutyl)-N-(ethylisoluminol) -functionalized gold nanoparticle (ABEI-AuNP) hybrid with graphene oxide nanoribbons (GONRs) as a functional supporting matrix on a modified screen-printed electrode (SPE) was studied under alkaline conditions. In our catalytic system, ABEI-AuNPs supported by GONRs were profoundly superior to the unsupported ABEI-AuNP/SPE, and exhibited greatly enhanced ECL intensity (≈30.0%). This difference is attributed not only to an 80.2% increase in the total surface area of the ABEI-AuNP-GONR/SPE, but also to enhancements of the ABEI-AuNP catalytic activity resulting from metal-oxygen bonding between the functional groups on the GONRs and the Au active sites. This improved catalytic activity of ABEI-AuNP facilitates both oxidative radical generation and fast reaction kinetics of the ABEI oxidation process. To further elucidate the mechanism of the counter-peak phenomenon in the ABEI ECL under cyclic voltammetry (CV) conditions, the effects of various factors, including pH of buffer solution, existence of dissolved oxygen, and concentration of hydrogen peroxide, on the ECL of ABEI were investigated. The mechanisms of liquid-phase ABEI on bare SPE and GONR/SPE were also compared to that of solid-phase ABEI-AuNP to validate the proposed mechanism for ABEI-AuNP-GONR/SPE.