Iron-Based Oxygen Scavengers on Mesoporous Silica Nanospheres

Yanling He; Abdul Khaleed; Po Shan Lo; Ishaq Ahmad; Alan Man Ching Ng; Aleksandra B Djurišić

doi:10.1021/acsomega.3c01242

Iron-Based Oxygen Scavengers on Mesoporous Silica Nanospheres

ACS Omega. 2023 Jun 5;8(24):21689-21695. doi: 10.1021/acsomega.3c01242. eCollection 2023 Jun 20.

Authors

Yanling He¹, Abdul Khaleed¹, Po Shan Lo¹, Ishaq Ahmad¹, Alan Man Ching Ng², Aleksandra B Djurišić¹

Affiliations

¹ Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong SAR, China.
² Core Research Facilities, Southern University of Science and Technology, No. 1088, Xueyuan Road, Shenzhen, Guangdong 518055, P. R. China.

Abstract

Iron-based materials are among the most commonly used oxygen scavengers. Here, we investigated the mesoporous silica nanosphere (MSN)-supported iron-based scavengers, such as FeO_x nanoparticles and different atomic layer deposition (ALD) coatings (FeO_x and Fe). We found that the scavenger performance is a result of a complex interplay between available Brunauer-Emmett-Teller surface area and the scavenger composition, with the combination of infiltrated nanoparticles and Fe-ALD coating resulting in the best performance. When the glucose-based treatment of MSN is used to further enhance oxygen scavenging capacity, Fe-ALD coating yields the best performance, with a high oxygen adsorption capacity of 126.8 mL/g. ALD deposition of Fe represents a versatile method to introduce Fe-based oxygen scavengers onto different supports, and it can facilitate the integration of scavengers with different types of packaging, as the deposition can be performed at a low temperature of 150 °C.