College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
Anal Chem. 2012 Jun 5;84(11):4754-9. doi: 10.1021/ac300205w. Epub 2012 May 22.
This paper reports for the first time the electrogenerated chemiluminescence (ECL) behavior of graphite-like carbon nitride (g-C(3)N(4)) with K(2)S(2)O(8) as the coreactant. The possible ECL reaction mechanisms are proposed. The spectral features of the ECL emission and photoluminescence (PL) of g-C(3)N(4) are compared, and their resemblance demonstrates that the excited states of g-C(3)N(4) from both ECL and photoexcitation are the same. The effects of K(2)S(2)O(8) concentration, pH, g-C(3)N(4)/carbon powder ratio, and scan rate on the ECL intensity have been studied in detail. Furthermore, it is observed that the ECL intensity is efficiently quenched by trace amounts of Cu(2+). g-C(3)N(4) is thus employed to fabricate an ECL sensor which shows high selectivity to Cu(2+) determination. The limit of detection is determined as 0.9 nM. It is anticipated that g-C(3)N(4) could be a new class of promising material for fabricating ECL sensors.
本文首次报道石墨相氮化碳（g-C(3)N(4)）与 K(2)S(2)O(8)作为共反应物的电致化学发光（ECL）行为。提出了可能的 ECL 反应机制。比较了 g-C(3)N(4)的 ECL 发射和光致发光（PL）的光谱特征，它们的相似性表明，来自 ECL 和光激发的 g-C(3)N(4)的激发态是相同的。详细研究了 K(2)S(2)O(8)浓度、pH 值、g-C(3)N(4)/碳粉比和扫描速率对 ECL 强度的影响。此外，观察到 ECL 强度被痕量 Cu(2+)有效地猝灭。因此，g-C(3)N(4)被用于制造 ECL 传感器，该传感器对 Cu(2+)的测定具有高选择性。检测限确定为 0.9 nM。预计 g-C(3)N(4)可能成为制造 ECL 传感器的一类有前途的新材料。
