Can metal–organic frameworks be used for cannabis breathalyzers?

Authors: Daniele Ongari1*, Yifei Michelle Liu2, Berend Smit1

  1. Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1951 Sion, Valais, Switzerland
  2. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States
  • Corresponding author email: daniele.ongari@epfl.ch

DOI10.24435/materialscloud:2019.0046/v1 (version v1, submitted on 02 September 2019)

How to cite this entry

Daniele Ongari, Yifei Michelle Liu, Berend Smit, Can metal–organic frameworks be used for cannabis breathalyzers?, Materials Cloud Archive (2019), doi: 10.24435/materialscloud:2019.0046/v1.

Description

∆9-tetrahydrocannabinol (THC) is the principal psychoactive component of cannabis, and there is an urgent need to build low-cost and portable devices that can detect its presence from breath. Similarly to alcohol detectors, these tools can be used by law enforcement to determine driver intoxication and enforce safer and more regulated use of cannabis. In this work, we propose to use a class of microporous crystals, metal–organic frameworks (MOFs), to selectively adsorb THC that can be later detected using optical, electrochemical, or fluorescence-based sensing methods. We screened computationally more than 5000 MOFs, highlighting the materials that have the largest affinity with THC, as well as the highest selectivity against water, showing that it is thermodynamically feasible for MOFs to adsorb THC from humid breath. We propose and compare different models for THC and different computational protocols to rank the promising materials, also presenting a novel approach to assess the permeability of nonspherical molecules in a porous framework. We identified three adsorption motifs in MOFs with high affinity to THC, which we refer to as “narrow channels”, “thick walls” and “parking spots”. Therefore, we expect our protocols and our findings to be generalizable for different classes of microporous materials, and also for investigating the adsorption properties of other large molecules that, like THC, have a nonspherical shape.

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License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.

External references

Journal reference
D. Ongari, Y. M. Liu, B. Smit, ACS Applied Materials & Interface doi:10.1021/acsami.9b13357

Keywords

gas adsorption tetrahydrocannabinol THC cannabis breathalyzer metal-organic frameworks

Version history

02 September 2019 [This version]