Copper-induced synthesis of palladium/copper popcorn nanoparticles as sensors for differential pulse voltammetric determ
- PDF / 2,286,817 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 47 Downloads / 179 Views
ORIGINAL PAPER
Copper-induced synthesis of palladium/copper popcorn nanoparticles as sensors for differential pulse voltammetric determination of dopamine Ming-Hung Chiang 1 & Bang-De Hong 1 & Tzu-Pei Wang 1 & Yu-Min Lin 1 & Chien-Liang Lee 1 Received: 25 April 2019 / Accepted: 20 September 2019 # Springer-Verlag GmbH Austria, part of Springer Nature 2019
Abstract Popcorn nanoparticles (pop-NPs) consisting of a Pd/Cu alloy were synthesized using a seed-mediated growth method. The Cu and Pd atoms were co-deposited on a cubic Pd seed to reduce the energy of fault stacking. The same synthesis method with a reduced volume of the Cu(II) salt leads to Pd/Cu alloy nanoparticles with branches (br-NPs). Large Pd nanocubes (Pd NCs) were prepared via epitaxial deposition and using tetrachloropalladate (PdCl42−) only. The high-resolution TEM analysis results show the pop-NPs and br-NPs to be single crystals with 021 and 022 planes, respectively. The results of X-ray photoelectron spectroscopy and cyclic voltammetry measurements corroborated that Pd is enriched on both surfaces. The materials were placed on a glassy carbon electrode to obtain a differential pulse voltammetric sensor for dopamine (DA). The electrochemical sensitivities are (a) 1.55 μA μM−1 cm−2 for the Pd/Cu pop-NP sensor in its linear range (15–300 μM), (b) 1.17 μA μM−1 cm−2 for the br-NP sensor in the linear range (15–200 μM), and (c) 0.97 μA μM−1 cm−2 for the Pd NC sensor in its linear range (15–100 μM). The best working potentials are near 0.10 V (vs. SCE) for all three sensors. The pop-NP-based sensor performs particularly well due to it selectivity over ascorbic and uric acid. Keywords SAED . XRD . CV . DPV . Electrochemical surface area
Introduction Parkinson’s disease is a chronic, degenerative central nervous system disorder that causes involuntary muscle tremors [1] and mood abnormalities in patients, mainly because the patient cannot produce enough dopamine (DA). Due to the extremely low concentration of DA in blood containing ascorbic acid (AA) and uric acid (UA), the DA sensors require low detection limits and high sensitivity. Therefore, composite catalysts such as carbon-supported precious metal alloys and noble metals are typically used in DA sensors. Currently used for non-enzyme-type sensing, DA sensors are mostly Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-019-3866-y) contains supplementary material, which is available to authorized users. * Chien-Liang Lee [email protected]; [email protected] 1
Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807, Taiwan
composed of metal nanoparticles, such as Pt [2], Pd [3, 4], Au [5], Pd/Au [6, 7], Pd/Pt [8], Pd/Ag [9, 10], and Pt/Au [11]. Du and coworkers carried out studies [5] in which Au nanoplates were electrochemically deposited onto reduced graphene oxide (rGO)/ glassy carbon electrodes and employed as highly sensitive catalysts for determining DA in a linear range
Data Loading...
