Observation of Ag Nanoparticles in/on Ag@MIL-100(Fe) Prepared Through Different Procedures

Rubén Mahugo; Alvaro Mayoral; Manuel Sánchez-Sánchez; Isabel Diaz

doi:10.3389/fchem.2019.00686

Observation of Ag Nanoparticles in/on Ag@MIL-100(Fe) Prepared Through Different Procedures

Front Chem. 2019 Oct 22:7:686. doi: 10.3389/fchem.2019.00686. eCollection 2019.

Authors

Rubén Mahugo¹, Alvaro Mayoral², Manuel Sánchez-Sánchez¹, Isabel Diaz¹

Affiliations

¹ Instituto de Catálisis y Petroleoquímica (ICP), CSIC, Madrid, Spain.
² Center for High-Resolution Electron Microscopy, School of Physical Science and Technology (SPST), ShanghaiTech University, Shanghai, China.

Abstract

Loading of active metals, metal clusters, and/or metal nanoparticles in Metal Organic Frameworks (MOFs) is an emergent field with applications in sensors, catalysis, medicine, and even in the polymeric industry. In the present work, MIL-100(Fe) has been synthesized and reacted with AgNO₃ through liquid and incipient wetness, and also through solid-state reaction or solid grinding. The aim of this study is to evaluate whether the MIL-100 would uptake metal particles using a similar principle as that of the ion exchange in zeolites, or else, their inherent humidity would favor the "dissolution" of the metal salt, thus yielding very small metal particles. The immobilization of Ag nanoparticles inside the MOF pores was identified by C_s-corrected scanning transmission electron microscopy (C_s-corrected STEM) techniques.

Keywords: Ag@MIL-100(Fe); MOF; STEM/HAADF; TEM; impregnation.