期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202207457
关键词
graphitic carbon nitride; poly(triazine imide); stacking order; proton conduction; iDPC-STEM
资金
- Swiss National Science Foundation (SNSF) [20021_192005]
- Ecole Polytechnique Federale de Lausanne
Poly(triazine imide) (PTI) is a graphitic carbon nitride with ordered pores at the angstrom scale. Acid treatment can remove ions and create open pore structure. The presence of ion-depleted open pores is directly observed using atomic resolution microscopy for the first time.
Poly(triazine imide) or PTI is an ordered graphitic carbon nitride hosting angstrom-scale pores attractive for selective molecular transport. AA'-stacked PTI layers are synthesized by ionothermal route during which ions occupy the framework and occlude the pores. Synthesis of ion-free PTI hosting AB-stacked layers has been reported, however, pores in this configuration are blocked by the neighboring layer. The unavailability of open pore limits application of PTI in molecular transport. Herein, we demonstrate acid treatment for ion depletion which maintains AA' stacking and results in open pore structure. We provide first direct evidence of ion-depleted open pores by imaging with the atomic resolution using integrated differential phase-contrast scanning transmission electron microscopy. Depending on the extent of ion-exchange, AA' stacking with open channels and AB stacking with closed channels are obtained and imaged for the first time. The accessibility of open channels is demonstrated by enhanced proton transport through ion depleted PTI.
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