Carbon Atom Hybridization Matters: Ultrafast Humidity Response of Graphdiyne Oxides

Abstract

Graphdiyne oxide (GDO), the oxidized form of graphdiyne (GDY), exhibits an ultrafast humidity response with an unprecedented response speed (ca. 7 ms), which is three times faster than that of graphene oxide (GO) with the same thickness and O/C ratio. The ultrafast humidity response of GDO is considered to benefit from the unique carbon hybridization of GDO, which contains acetylenic bonds that are more electron-withdrawing than ethylenic bonds in GO, consequently giving rise to a faster binding rate with water. This distinctive structure-based property enables the fabrication of a novel GDO-based humidity sensor with an ultrafast response speed and good selectivity against other kinds of gas molecules as well as high sensitivity. These properties allow the sensor to accurately monitor the respiration rate change of human and hypoxic rats.

Superhydrophilic Graphdiyne Accelerates Interfacial Mass/Electron Transportation to Boost Electrocatalytic and Photoelectrocatalytic Water Oxidation Activity

“…In contrast, a greatly increased proportion of oxygenic groups in superhydrophilic GDY was observed (Figure f) and the increased oxygen species was mainly CO group (Figure S3, Supporting Information). In the Raman spectra of superhydrophilic GDY, the acetylenic bond peaks shifted to higher wavenumber with lowered intensity, further confirming some alkyne groups were oxidized to electron‐withdrawing groups (Figure S4, Supporting Information) . All of the observations demonstrated that air‐plasma treated GDY kept the basic skeleton of GDY and the introduced oxygenic groups enabled the superhydrophilicity of GDY from hydrophobicity.…”

Water Adsorption and Transport on Oxidized Two‐Dimensional Carbon Materials

“…c) Water adsorption response of bare (black), GDO‐coated (red), and GO‐coated (blue) Au plates. d) Illustration of the binding model between GO, GDO, and water . Copyright 2018, Wiley‐VCH.…”

“…Very recently,w er eportedf or the first time that graphdiyne oxide (GDO), the oxidized form of GDY, shows an ultrafasth umidity response ( % 12 ms) (Figure 6b), [64] which is three times faster than that of GO ( % 34 ms). By reducing its thickness to approximately 75 nm, the response time wass hortened to 7ms, superior to all other reportedh umidity sensors.…”

“…Insets:T yndall effects of GDOnanosheets dispersed in water.b)Normalized response of the 100 nm-thick GDO-based (red curve) and GO-based (blue curve) sensors toward ah umid air flow.c)Water adsorption response of bare (black), GDO-coated (red), andGO-coated (blue) Au plates. d) Illustrationoft he binding model betweenG O, GDO, and water [64]. Copyright 2018, Wiley-VCH.…”

High‐Yield and Damage‐free Exfoliation of Layered Graphdiyne in Aqueous Phase

“…[1][2][3] It contains diacetylenic linkages (-CCÀ CC-) between carbon hexagons with an extended p-conjugation structure,uniformly distributed pores,low reduction potential, [4] and high carrier mobility. [5] With these distinct physicochemical properties,G DY has been used for many applications such as separation, [6] sensing, [7,8] catalysis, [4,9] and electronic devices, [10] as well as energy storage/conver-…”