Convenient synthesis of three-dimensional hierarchical CuS@Pd core-shell cauliflowers decorated on nitrogen-doped reduce
- PDF / 1,675,890 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 89 Downloads / 138 Views
ORIGINAL PAPER
Convenient synthesis of three-dimensional hierarchical CuS@Pd core-shell cauliflowers decorated on nitrogen-doped reduced graphene oxide for non-enzymatic electrochemical sensing of xanthine Ying Cui 1,2 & Junhua Li 2,3 & Mengqin Liu 2 & Haixia Tong 4 & Zeng Liu 5 & Jiawen Hu 1 & Dong Qian 3 Received: 17 June 2020 / Accepted: 25 September 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract 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. Keywords Core-shell heterostructures . Xanthine . Non-enzymatic sensor . Electrochemical detection
Introduction Quantitation of the biomarker xanthine is of prime importance in the fields of clinical analysis and food quality control.
Several kinds of techniques such as high-performance liquid chromatography [1], capillary electrophoresis [2], surface plasmon resonance combined with optical fiber [3], fluorescence method [4], and colorimetric method [5] have been
Ying Cui and Junhua Li contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04570-7) contains supplementary material, which is available to authorized users. * Dong Qian [email protected] 1
2
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 Norma
Data Loading...
