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. 2020 Apr 7:8:244.
doi: 10.3389/fchem.2020.00244. eCollection 2020.

Trimetallic PdCuAu Nanoparticles for Temperature Sensing and Fluorescence Detection of H 2 O 2 and Glucose

Furong Nie  1 , Lu Ga  2 , Jun Ai  1 , Yong Wang  3
Affiliations

Trimetallic PdCuAu Nanoparticles for Temperature Sensing and Fluorescence Detection of H 2 O 2 and Glucose

Furong Nie et al. Front Chem. .

Abstract

The design of palladium-based nanostructures has good prospects in various applications. This paper reports a simple one-step synthesis method of PdCuAu nanoparticles (PdCuAu NPs) prepared directly in aqueous solution. PdCuAu NPs have attracted much attention owing to their unique synergistic electronic effect, optical and catalytic performance. As temperature sensor, PdCuAu NPs are sensitive to the fluorescence intensity change in the temperature range of 4-95°C, which is due to its unique optical properties. The prepared PdCuAu NPs have excellent catalytic performance for peroxidase-like enzymes. It can catalyze TMB rapidly in the presence of hydrogen peroxide and oxidize it to visible blue product (oxTMB). Based on its unique peroxidase-like properties, this study used PdCuAu NPs colorimetric platform detection of hydrogen peroxide and glucose. The linear ranges of hydrogen peroxide and glucose were 0.1-300 μM and 0.5-500 μM, respectively, and the detection limits (LOD) were 5 and 25 nM, respectively. This simple and rapid method provides a good prospect for the detection of H2O2 and glucose in practical applications.

Keywords: colorimetric system; peroxidase-like activity; sensor; temperature-sensitive; trimetallic alloyed nanoparticles.

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Figures

Scheme 1
Scheme 1
Synthesis of PdCuAu NPs and their application as temperature sensors and colorimetric detection of H2O2 and glucose with enzyme mimic.
Figure 1
Figure 1
Fluorescence spectra of PdCuAu NPs. [Insets, the left panel was shown in visible light, and the right was viewed under UV radiation (365 nm)].
Figure 2
Figure 2
(a) TEM images of the PdCuAu NPs. (b) The size distribution of PdCuAu NPs. (c) HRTEM image of the PdCuAu NPs. (d) The lattice fringes in the square area in (c) and the inset displays the corresponding FFT pattern.
Figure 3
Figure 3
(A) XRD pattern of PdCuAu NPs, the standard patterns of pure Au (JCPDS card no. 04-0784), Pd (JCPDS card no. 46-1043) and Cu (JCPDS card no. 04-0836) are shown for comparison. (B) FT-IR spectra of pure PVP, CuAu, PdAu, PdCu, and PdCuAu NPs. (C) X-ray photoelectron spectroscopy spectra of Pd 3d, Cu 2p, and Au 4f of the as-prepared PdCuAu NPs.
Figure 4
Figure 4
(A) Fluorescence spectra of PdCuAu NPs with temperature ranging from 4 to 95°C. (B) The linear relationship between changes of temperature and fluorescence intensity. (C) The fluorescence response of eight cycles at 4–95°C.
Figure 5
Figure 5
(A) The absorption spectra of PdCuAu NPs and TMB system upon adding different concentrations of H2O2 (0.1–300 μM, from bottom to top). (B) The corresponding linear calibration plots for H2O2, top: the corresponding color changes.
Figure 6
Figure 6
(A) The absorption spectra of PdCuAu NPs and TMB system upon adding different concentrations of glucose (0.5–500 μM, from bottom to top). (B) The corresponding linear calibration plots for glucose, top: the corresponding color changes.
See this image and copyright information in PMC

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