Twinned Growth of Metal-Free, Triazine-Based Photocatalyst Films as Mixed-Dimensional (2D/3D) van der Waals Heterostructures

0481368 - ÚOCHB 2018 RIV DE eng J - Článek v odborném periodiku
Schwarz, D. - Noda, Yu - Klouda, J. - Schwarzová-Pecková, K. - Tarábek, Ján - Rybáček, Jiří - Janoušek, Jiří - Simon, F. - Opanasenko, Maksym - Čejka, Jiří - Acharjya, A. - Schmidt, J. - Selve, S. - Reiter-Scherer, V. - Severin, N. - Rabe, J. P. - Ecorchard, Petra - He, J. - Položij, M. - Nachtigall, P. - Bojdys, Michael J.
Twinned Growth of Metal-Free, Triazine-Based Photocatalyst Films as Mixed-Dimensional (2D/3D) van der Waals Heterostructures.
Advanced Materials. Roč. 29, č. 40 (2017), č. článku 1703399. ISSN 0935-9648. E-ISSN 1521-4095
Institucionální podpora: RVO:61388963 ; RVO:61388955 ; RVO:61388980
Klíčová slova: 2D materials * conjugated microporous polymers * donor-acceptor * membranes * triazine
Obor OECD: Nano-materials (production and properties); Physical chemistry (UFCH-W); Inorganic and nuclear chemistry (UACH-T)
Impakt faktor: 21.950, rok: 2017

Design and synthesis of ordered, metal-free layered materials is intrinsically difficult due to the limitations of vapor deposition processes that are used in their making. Mixed-dimensional (2D/3D) metal-free van der Waals (vdW) heterostructures based on triazine (C3N3) linkers grow as large area, transparent yellow-orange membranes on copper surfaces from solution. The membranes have an indirect band gap (E-g,E-opt = 1.91 eV, E-g,E-elec = 1.84 eV) and are moderately porous (124 m(2) g(-1)). The material consists of a crystalline 2D phase that is fully sp(2) hybridized and provides structural stability, and an amorphous, porous phase with mixed sp(2)-sp hybridization. Interestingly, this 2D/3D vdW heterostructure grows in a twinned mechanism from a one-pot reaction mixture: unprecedented for metal-free frameworks and a direct consequence of on-catalyst synthesis. Thanks to the efficient type I heterojunction, electron transfer processes are fundamentally improved and hence, the material is capable of metal-free, light-induced hydrogen evolution from water without the need for a noble metal cocatalyst (34 mu mol h(-1) g(-1) without Pt). The results highlight that twinned growth mechanisms are observed in the realm of ”wet” chemistry, and that they can be used to fabricate otherwise challenging 2D/3D vdW heterostructures with composite properties.
Trvalý link: http://hdl.handle.net/11104/0276952