Mesoporous silica nanosphere-based oxygen scavengers

He，Yanling1,2; Hu，Xiaoqing1; Xu，Muxian2; Ng，Alan Man Ching2; Djurišić，Aleksandra B.1

2021-11-01

10.1016/j.micromeso.2021.111426

MICROPOROUS AND MESOPOROUS MATERIALS   影响因子和分区

1387-1811

We synthesized mesoporous silica nanospheres (MSNs) with small particle size (under 100 nm) and large surface areas (>800 m/g) by modified Stöber method. We investigated coating of oxygen adsorber materials (iron-based and titania-based) by atomic layer deposition on the prepared MSNs. We found that MSNs without any coating are capable of adsorbing oxygen by physisorption, and that due to their high surface areas they can outperform commercial oxygen scavengers for atmospheres with moderate and low humidity levels. Their performance is further enhanced for optimized thickness of FeO or TiO coating, where chemisorption contributes to oxygen scavenging process. To further investigate the oxygen adsorption on MSNs, samples with different annealing times were prepared and characterized, and the oxygen adsorption could be attributed to incomplete removal of silicon precursor residue. While the samples with prolonged annealing time do not exhibit oxygen adsorption, the high oxygen adsorption capacity can be restored by glucose treatment which results in carbon-based surface coating of MSNs. Due to their fast response and high oxygen adsorption capacity, the prepared materials are highly promising as oxygen scavengers, in particular for applications in dry environments where humidity activation is undesirable.

ALD Mesoporous silica Oxygen scavenger

SCI ; EI

英语

其他

WOS:000703753100005

20213710891906

Atomic layer deposition ; Gas adsorption ; Iron compounds ; Mesoporous materials ; Nanospheres ; Oxygen ; Particle size ; Silica ; Titanium dioxide

Nanotechnology:761 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Coating Techniques:813.1 ; Coating Materials:813.2 ; Solid State Physics:933 ; Crystal Growth:933.1.2

MATERIALS SCIENCE

2-s2.0-85114698279

Scopus

1.Department of Physics,The University of Hong Kong,Pokfulam Road,Hong Kong
2.Department of Physics,Southern University of Science and Technology,Shenzhen,China

He，Yanling,Hu，Xiaoqing,Xu，Muxian,et al. Mesoporous silica nanosphere-based oxygen scavengers[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2021,327.

He，Yanling,Hu，Xiaoqing,Xu，Muxian,Ng，Alan Man Ching,&Djurišić，Aleksandra B..(2021).Mesoporous silica nanosphere-based oxygen scavengers.MICROPOROUS AND MESOPOROUS MATERIALS,327.

He，Yanling,et al."Mesoporous silica nanosphere-based oxygen scavengers".MICROPOROUS AND MESOPOROUS MATERIALS 327(2021).