College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, People's Republic of China.
Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Hunan Province Universities Key Laboratory of Functional Organometallic Materials, College of Chemistry and Material Science, Hengyang Normal University, Hengyang, 421008, People's Republic of China.
Mikrochim Acta. 2020 Oct 5;187(11):589. doi: 10.1007/s00604-020-04570-7.
A novel hybrid with three-dimensional (3D) hierarchical CuS@Pd core-shell cauliflowers decorated on nitrogen-doped reduced graphene oxide (CuS@Pd/N-RGO) has been prepared by a facile wet-chemical route without utilizing any template molecules and surfactants. The characterization results reveal that the 3D flower-like structure of CuS "core" is composed of interconnecting nanoplates, which is conductive to the loading of Pd nanoparticles' "shell" and results in the robust interaction between the core and shell for the formation of CuS@Pd cauliflowers. Anchoring such appealing CuS@Pd cauliflowers on the two-dimensional N-RGO can efficaciously inhibit the aggregation of CuS@Pd cauliflowers and accelerate the kinetics of xanthine oxidation. Benefiting from the multi-functional properties and unique morphology, the sensor constructed by CuS@Pd/N-RGO exhibits excellent performance for non-enzymatic detection of xanthine including a wide detection range of 0.7-200.0 μM (0.94 V vs. SCE), a low detection limit of 28 nM (S/N = 3), high reproducibility (relative standard deviation (RSD) = 4.1%), and commendable stability (retained 90% of the initial electrochemical responses after storage for 30 days), which is amongst the best of various electrochemical sensors reported for xanthine assays till date. Reliable and satisfying recoveries (95-105%, RSD ≤ 4.1%) are achieved for xanthine detection in real samples. The inspiring results make the uniquely structural CuS@Pd/N-RGO greatly promising in non-enzymatic electrochemical sensing applications. Graphical abstract A high-performance non-enzymatic xanthine sensor has been constructed by the three-dimensional hierarchical CuS@Pd core-shell cauliflowers decorated on nitrogen-doped reduced graphene oxide.
一种新颖的具有三维（3D）分层 CuS@Pd 核壳结构的花椰菜状纳米结构，由氮掺杂还原氧化石墨烯（CuS@Pd/N-RGO）修饰而成，通过一种简单的湿化学方法制备，无需使用任何模板分子和表面活性剂。表征结果表明，3D 花椰菜状 CuS“核”由相互连接的纳米板组成，有利于 Pd 纳米颗粒“壳”的负载，并导致核与壳之间的强相互作用，从而形成 CuS@Pd 花椰菜状纳米结构。将这些引人注目的 CuS@Pd 花椰菜状纳米结构锚定在二维 N-RGO 上，可以有效地抑制 CuS@Pd 花椰菜状纳米结构的聚集，并加速黄嘌呤氧化的动力学过程。得益于多功能特性和独特的形态，由 CuS@Pd/N-RGO 构建的传感器对黄嘌呤的非酶检测表现出优异的性能，包括较宽的检测范围（0.7-200.0 μM，0.94 V 对 SCE）、较低的检测限（28 nM，S/N = 3）、高重现性（相对标准偏差（RSD）为 4.1%）和令人满意的稳定性（在 30 天的储存后保留了初始电化学响应的 90%），这在迄今为止报道的各种用于黄嘌呤分析的电化学传感器中是最好的之一。在实际样品中，黄嘌呤的检测具有可靠和令人满意的回收率（95-105%，RSD ≤ 4.1%）。这些鼓舞人心的结果使得独特结构的 CuS@Pd/N-RGO 在非酶电化学传感应用中具有广阔的应用前景。
