Langmuir-Blodgett Films of the Metal-Organic Framework MIL-101(Cr): Preparation, Characterization, and CO2 Adsorption Study Using a QCM-Based Setup

Javier Benito; Sara Sorribas; Irene Lucas; Joaquin Coronas; Ignacio Gascon

doi:10.1021/acsami.6b04272

Langmuir-Blodgett Films of the Metal-Organic Framework MIL-101(Cr): Preparation, Characterization, and CO2 Adsorption Study Using a QCM-Based Setup

ACS Appl Mater Interfaces. 2016 Jun 29;8(25):16486-92. doi: 10.1021/acsami.6b04272. Epub 2016 Jun 20.

Authors

Javier Benito^{1

2}, Sara Sorribas^{1

2}, Irene Lucas^{1

2}, Joaquin Coronas^{1

2}, Ignacio Gascon^{1

2}

Affiliations

¹ Departamento de Química Física, Facultad de Ciencias and ∥Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad de Zaragoza , 50009 Zaragoza, Spain.
² Instituto de Nanociencia de Aragón (INA) and §Chemical and Environmental Engineering Department, Universidad de Zaragoza , 50018 Zaragoza, Spain.

PMID: 27268426
DOI: 10.1021/acsami.6b04272

Abstract

This work reports the fabrication and characterization of Langmuir-Blodgett films of nanoparticles (size 51 ± 10 nm) of the metal organic framework MIL-101(Cr). LB film characterization by SEM, UV-vis, GIXRD, and QCM has shown that the addition of 1 wt % of behenic acid to MOF dispersion allows obtaining dense monolayers at the air-water interface that can be deposited onto solid substrates of different nature with transfer ratios close to 1. Moreover, a QCM-based setup has been built and used for the first time to measure CO2 adsorption isotherms at 303 K on MOF LB films, proving that LB films with MOF masses between 1.2 (1 layer) and 2.3 (2 layers) μg can be used to obtain accurate adsorption values at 100 kPa, similar to those obtained by conventional adsorption methods that require much larger MOF quantities (tens of milligrams).

Keywords: CO2 adsorption; Langmuir and Langmuir−Blodgett (LB) films; MIL-101(Cr); metal organic framework; nanoparticles (NPs); quartz crystal microbalance (QCM).