Large work function difference driven electron transfer from electrides to single-walled carbon nanotubes
AuthorsMenamparambath, Mini Mol
Park, Jong Ho
Yoo, Ho Sung
Patole, Shashikant P.
Yoo, Ji Beom
Kim, Sung Wng
KAUST DepartmentMaterials Science and Engineering Program
Permanent link to this recordhttp://hdl.handle.net/10754/594068
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AbstractA difference in work function plays a key role in charge transfer between two materials. Inorganic electrides provide a unique opportunity for electron transfer since interstitial anionic electrons result in a very low work function of 2.4-2.6 eV. Here we investigated charge transfer between two different types of electrides, [Ca2N]+·e- and [Ca 24Al28O64]4+·4e-, and single-walled carbon nanotubes (SWNTs) with a work function of 4.73-5.05 eV. [Ca2N]+·e- with open 2-dimensional electron layers was more effective in donating electrons to SWNTs than closed cage structured [Ca24Al28O64] 4+·4e- due to the higher electron concentration (1.3 × 1022 cm-3) and mobility (∼200 cm 2 V-1 s-1 at RT). A non-covalent conjugation enhanced near-infrared fluorescence of SWNTs as high as 52%. The field emission current density of electride-SWNT-silver paste dramatically increased by a factor of 46000 (14.8 mA cm-2) at 2 V μm-1 (3.5 wt% [Ca2N]+·e-) with a turn-on voltage of 0.85 V μm-1. This journal is © the Partner Organisations 2014.
CitationMenamparambath MM, Park J-H, Yoo H-S, Patole SP, Yoo J-B, et al. (2014) Large work function difference driven electron transfer from electrides to single-walled carbon nanotubes. Nanoscale 6: 8844. Available: http://dx.doi.org/10.1039/c4nr01629g.
PublisherRoyal Society of Chemistry (RSC)