Limits...
Fabrication of SnO₂-reduced graphite oxide monolayer-ordered porous film gas sensor with tunable sensitivity through ultra-violet light irradiation.

Xu S, Sun F, Yang S, Pan Z, Long J, Gu F - Sci Rep (2015)

Bottom Line: Graphite oxide sheets dispersed in SnSO4 aqueous solution exhibited excellent affinity with template microspheres and were in situ incorporated into the pore walls during UV-induced growth of SnO2.This film was directly used as gas-sensor and was able to display high sensitivity in detecting ethanol gas.This study provides efficient ways of conducting the in situ fabrication of a semiconductor-reduced graphite oxide film device with uniform surface structure and controllable properties.

View Article: PubMed Central - PubMed

Affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China.

ABSTRACT
A new graphene-based composite structure, monolayer-ordered macroporous film composed of a layer of orderly arranged macropores, was reported. As an example, SnO2-reduced graphite oxide monolayer-ordered macroporous film was fabricated on a ceramic tube substrate under the irradiation of ultra-violet light (UV), by taking the latex microsphere two-dimensional colloid crystal as a template. Graphite oxide sheets dispersed in SnSO4 aqueous solution exhibited excellent affinity with template microspheres and were in situ incorporated into the pore walls during UV-induced growth of SnO2. The growing and the as-formed SnO2, just like other photocatalytic semiconductor, could be excited to produce electrons and holes under UV irradiation. Electrons reduced GO and holes adsorbed corresponding negative ions, which changed the properties of the composite film. This film was directly used as gas-sensor and was able to display high sensitivity in detecting ethanol gas. More interestingly, on the basis of SnO2-induced photochemical behaviours, this sensor demonstrated tunable sensitivity when UV irradiation time was controlled during the fabrication process and post in water, respectively. This study provides efficient ways of conducting the in situ fabrication of a semiconductor-reduced graphite oxide film device with uniform surface structure and controllable properties.

No MeSH data available.


SEM image of a colloidal monolayer wrapped with GO sheets.The inset shows a lateral view of the monolayer.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4355683&req=5

f5: SEM image of a colloidal monolayer wrapped with GO sheets.The inset shows a lateral view of the monolayer.

Mentions: GO sheets used here showed excellent hydrophilicity, affinity with PS microspheres and flexibility. To prove it, a colloidal monolayer template was floated onto the surface of a pure GO suspension (4.0 × 10−5 g/mL) by the same manipulation as that shown in Fig. 2a, and then it was directly picked up with a ceramic tube and dried at 60°C. As shown in Fig. 5, the interstices among PS microspheres had been filled with GO sheets. The lower part of PS microspheres immersed into the water had adsorbed some GO sheets due to the π-π stacking action38 and been wrapped (inset of Fig. 5). These characters provided the chance for the formation of rGO-incorporated porous films in aqueous solutions.


Fabrication of SnO₂-reduced graphite oxide monolayer-ordered porous film gas sensor with tunable sensitivity through ultra-violet light irradiation.

Xu S, Sun F, Yang S, Pan Z, Long J, Gu F - Sci Rep (2015)

SEM image of a colloidal monolayer wrapped with GO sheets.The inset shows a lateral view of the monolayer.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4355683&req=5

f5: SEM image of a colloidal monolayer wrapped with GO sheets.The inset shows a lateral view of the monolayer.
Mentions: GO sheets used here showed excellent hydrophilicity, affinity with PS microspheres and flexibility. To prove it, a colloidal monolayer template was floated onto the surface of a pure GO suspension (4.0 × 10−5 g/mL) by the same manipulation as that shown in Fig. 2a, and then it was directly picked up with a ceramic tube and dried at 60°C. As shown in Fig. 5, the interstices among PS microspheres had been filled with GO sheets. The lower part of PS microspheres immersed into the water had adsorbed some GO sheets due to the π-π stacking action38 and been wrapped (inset of Fig. 5). These characters provided the chance for the formation of rGO-incorporated porous films in aqueous solutions.

Bottom Line: Graphite oxide sheets dispersed in SnSO4 aqueous solution exhibited excellent affinity with template microspheres and were in situ incorporated into the pore walls during UV-induced growth of SnO2.This film was directly used as gas-sensor and was able to display high sensitivity in detecting ethanol gas.This study provides efficient ways of conducting the in situ fabrication of a semiconductor-reduced graphite oxide film device with uniform surface structure and controllable properties.

View Article: PubMed Central - PubMed

Affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China.

ABSTRACT
A new graphene-based composite structure, monolayer-ordered macroporous film composed of a layer of orderly arranged macropores, was reported. As an example, SnO2-reduced graphite oxide monolayer-ordered macroporous film was fabricated on a ceramic tube substrate under the irradiation of ultra-violet light (UV), by taking the latex microsphere two-dimensional colloid crystal as a template. Graphite oxide sheets dispersed in SnSO4 aqueous solution exhibited excellent affinity with template microspheres and were in situ incorporated into the pore walls during UV-induced growth of SnO2. The growing and the as-formed SnO2, just like other photocatalytic semiconductor, could be excited to produce electrons and holes under UV irradiation. Electrons reduced GO and holes adsorbed corresponding negative ions, which changed the properties of the composite film. This film was directly used as gas-sensor and was able to display high sensitivity in detecting ethanol gas. More interestingly, on the basis of SnO2-induced photochemical behaviours, this sensor demonstrated tunable sensitivity when UV irradiation time was controlled during the fabrication process and post in water, respectively. This study provides efficient ways of conducting the in situ fabrication of a semiconductor-reduced graphite oxide film device with uniform surface structure and controllable properties.

No MeSH data available.