Abstract
Recently, graphene oxide nanoscroll (GONS) has attracted much attention due to its excellent properties. Encapsulation of nanomaterials in GONS can greatly enhance its performance while ion encapsulation is still unexplored. Herein, various ions including hydronium ion (H3O+), Fe3+, Au3+, and Zn2+ were encapsulated in GONSs by molecular combing acidic graphene oxide (GO) solution. No GONS was obtained when the pH of the GO solution was greater than 9. A few GONSs without encapsulated ion were obtained at the pH of 5–8. When the pH decreased from 5 to 0.15, high-density GONSs with encapsulated ions were formed and the average height of GONS was increased from ~50 to ~190 nm. These results could be attributed to the varied repulsion between carboxylic acid groups located at the edges of GO nanosheets. Encapsulated metal ions were converted to nanoparticles in GONS after high-temperature annealing. The resistance-type device based on reduced GONS (rGONS) mesh with encapsulated H3O+ showed good response for applied pressure from 600 to 8700 Pa, which manifested much better performance compared with that of a device based on rGONS mesh without H3O+.
Highlights
In recent years, graphene and graphene-based composite have exhibited promising pressure sensing behaviors due to their excellent conductivities, remarkable elasticities, and extraordinary stiffness [1,2,3,4,5,6]
Graphene and graphene oxide nanoscrolls (GONS) have attracted significant attention due to their excellent electrical and mechanical properties, which stem from their opened ends and adjustable interlayer distance [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]
atomic force microscopy (AFM) measurement showed the height of (GONS)5 was 41.7 nm (Figure 1f), which is consistent with previously reported results [12,17]
Summary
Graphene and graphene-based composite have exhibited promising pressure sensing behaviors due to their excellent conductivities, remarkable elasticities, and extraordinary stiffness [1,2,3,4,5,6]. GONS has shown broad applications in the fields of sensors, supercapacitors, field effect transistors, energy storage, and so on [13,14,17,22,23,24,25,26]. Various nanomaterials, such as nanoparticles, nanowires, and small molecules can be encapsulated into GONSs to further improve their performance [13,14,15,19,20,27,28,29,30,31,32,33]. It is highly desirable to investigate the pressure sensing ability of GONS
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