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. 2024 May 10;9(20):21939-21947.
doi: 10.1021/acsomega.3c09973. eCollection 2024 May 21.

Morphological and Structural Characterization of (Pt, Au, and Ag) Nanoparticle/Zn-MOF-74 Composites

Juliana Assunção Pereira de Figueiredo  1 , Maximiliano Jesús Moreno Zapata  1 , Laíse Serra Amorim  1 , João Alves de Oliveira Neto  1 , Douglas Rodrigues Miquita  2 , Edmar Avellar Soares  1 , Karla Balzuweit  1 , Carlos Basílio Pinheiro  1
Affiliations

Morphological and Structural Characterization of (Pt, Au, and Ag) Nanoparticle/Zn-MOF-74 Composites

Juliana Assunção Pereira de Figueiredo et al. ACS Omega. .

Abstract

Metallic nanoparticles (NPs) were decorated onto Zn-MOF-74 crystals by photoreducing different metal precursors (Pt, Au, and Ag) using ultraviolet (UV) light in an aqueous solution with different metal concentrations without using additional stabilizers. X-ray diffraction revealed the three-dimensional structural integrity and crystallinity conservation of Zn-MOF-74 crystals during the UV decoration process. Raman spectroscopy showed a minor rearrangement in the structure of the Zn-MOF-74 crystal surface after NP decoration. X-ray photoelectron spectroscopy confirmed the metal oxidation states of Zn and NPs. High-resolution transmission electron microscopy images proved the surface decoration of Zn-MOF-74 crystals with spherical metallic NPs with diameters between 2.4 and 9.8 nm.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
(a) Optical image of Zn-MOF-74 crystals obtained via solvothermal synthesis. Optical images of (b) PtNPs/Zn-MOF-74, (c) AuNPs/Zn-MOF-74, and (d) AgNPs/Zn-MOF-74 composites after the UV decoration process. Optical images were obtained using a LEICA DM 4500 P LED (80×) light microscope.
Figure 2
Figure 2
PXRD patterns of (a) Zn-MOF-74 (black), PtNPs/Zn-MOF-74 UVI (blue), and PtNPs/Zn-MOF-74 UVII (red) composites; (b) Zn-MOF-74 (black), AuNPs/Zn-MOF-74 UVI (blue), and AuNPs/Zn-MOF-74 UVII (red) composites; and (c) Zn-MOF-74 (black), AgNPs/Zn-MOF-74 UVI (blue), and AgNPs/Zn-MOF-74 UVII (red) composites. Integration times are between 4° < 2θ < 12° at 1× , 12° < 2θ < 32° at 5× , and 2θ > 32° at 10×. Bragg positions relative to the Zn-MOF-74 phase are shown in green bars. The peaks marked with ⧫, ■, and ▼ indicate the peaks of Pt (243678-ICSD), Au (64701-ICSD), and Ag (163723-ICSD) metal phases, respectively.
Figure 3
Figure 3
XPS spectra of PtNPs/Zn-MOF-74 (dark blue), AuNPs/Zn-MOF-74 (red), and AgNPs/Zn-MOF-74 composites and Zn-MOF-74 (black).
Figure 4
Figure 4
Raman spectra of Zn-MOF-74 (black) and MeNPs/Zn-MOF-74 UVI and UVII composites (blue and red, respectively). (a) PtNPs/Zn-MOF-74 composites in the relevant wavelength spectra range, and (b) peak shifts of PtNPs/Zn-MOF-74 composites. (c) AuNPs/Zn-MOF-74 composites in the relevant wavelength spectra range and (d) peak shifts of AuNPs/Zn-MOF-74 composites. (e) AgNPs/Zn-MOF-74 composites in the relevant wavelength spectra range.
Figure 5
Figure 5
BSE–SEM image of Zn-MOF-74 obtained via the solvothermal method.
Figure 6
Figure 6
HRTEM images of PtNPs/Zn-MOF-74 (UVI) (a,b) and PtNPs/Zn-MOF-74 (UVII) (c,d) composites. (d) PtNPs were identified by comparing the interference fringes and Bragg plane distances of Pt crystals (ICSD 243678).
Figure 7
Figure 7
HRTEM images of AuNPs/Zn-MOF-74 (UVI) (a,b) and AuNPs/Zn-MOF-74 (UVII) (c,d) composites. (d) AuNPs were identified by comparing the interference fringes and Bragg plane distances of the Au crystal (ICSD 64701).
Figure 8
Figure 8
HRTEM images of AgNPs/Zn-MOF-74(UVI) (a,b) and AgNPs/Zn-MOF-74(UVII) (c,d) composites. (d) AgNPs were identified by comparing the interference fringes and Bragg plane distances of Ag crystals (ICSD 163723).
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