The
fabrication of supported noble metal nanocrystals (NCs) with
well-controlled morphologies have been attracted considerable interests
due to their merits in a wide variety of applications. Photodeposition
is a facile and effective method to load metals over semiconductors
in a simple slurry reactor under irradiation. By optimizing the photodeposition
process, the size, chemical states, and the geometrical distribution
of metal NCs have been successfully tuned. However, metal NCs with
well-controlled shapes through the photodeposition process have not
been reported until now. Here, we report our important advances in
the controlled photodeposition process to load regular noble metal
NCs. Reduced graphene oxide (rGO) is introduced as a reservoir for
the fast transfer of photoelectrons to avoid the fast accumulation
of photogenerated electrons on the noble metals which makes the growth
process uncontrollable. Meanwhile, rGO also provides stable surface
for the controlled nucleation and oriented growth. Noble metal NCs
with regular morphologies are then evenly deposited on rGO. This strategy
has been demonstrated feasible for different precious metals (Pd,
Au, and Pt) and semiconductors (TiO2, ZnO, ZrO2, CeO2, and g-C3N4). In the prototype
application of electrochemical hydrogen evolution reaction, regular
Pd NCs with enclosed {111} facets showed much better performance compared
with that of irregular Pd NCs.
Single molecular magnets (SMMs) have become promising paradigms to develop novel spintronics for futuristic information technologies such as high-density information and quantum computing. The efficiency and characteristics of SMM devices are determined by the intrinsic nature of the molecular magnets placed in the spin transport pathway. In this work, to understand the role of the central magnetic ion on the performance of SMM devices, we screen the spin-conductance properties of whole 3d and 4d metalloporphyrins using the nonequilibrium Green's function formalism in conjunction with density functional theory. Our results show that the investigated SMMs according to spintronic conductance behavior can be categorized into three groups: type I non-spin-polarized, type II minor spin-polarized current, and type II major spin-polarized current devices. Type-II and type-II molecular systems show perfect spin filtering and spin-dependent negative differential resistance. The optimal energy alignment of spin-polarized molecular orbitals with gold electrodes results in one-channel spin transport (minor for type II and major for type II ). Thus type-II junctions are half-metal. The type-II junctions also show a voltage-induced spin switchability at low bias voltages. In this regard, type-II molecular systems are promising candidates for a low-power consumption spin filter, spin switch, memory, to name just a few. Our results highlight the practical applications of metalloporphyrin for the development of multipurpose miniature spintronic devices.
A series of thiophene-based donor-acceptor-donor (D–A–D) oligomer substituted metalloporphyrins (MPors) with different 3d central metal-ions (M=Co, Ni, Cu, and Zn) were systematically investigated to screen efficient hybrid photocatalysts for CO2...
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