Purposed Built ZnO/Zn₅(OH)₈Ac₂·2H₂O Architectures by Hydrothermal Synthesis

Abstract

Novel and extended ZnO/Zn 5 (OH) 8 Ac 2 3 2H 2 O architectures are desirable for many applications. Here we report on the design and growth of the novel ZnO/Zn 5 (OH) 8 Ac 2 3 2H 2 O architectures by a hydrothermal synthesis approach. ZnO microrods and/or columnar film are grown in the aqueous solution containing Zn(Ac) 2 3 2H 2 O and hexamethylenetetramine, while Zn 5 (OH) 8 Ac 2 3 2H 2 O microspheres and/or porous film are formed when enough citrate anions are added into the solution. The citrate anions not only modify the morphology but also decide the phase of the grown zinc compounds. The ZnO thin layer coated on glass substrate is used to control the nucleation event and finally modifies the morphology of the grown ZnO. Our work provides an effective and facile approach to design and selectively grow the novel ZnO/Zn 5 (OH) 8 Ac 2 3 2H 2 O architectures at a low temperature of 95 °C.

Rapid room-temperature synthesis of nanosheet-assembled ZnO mesocrystals with excellent photocatalytic activity

“…Self-assembly of ZnO can be realized by either using surfactants (polymers) [20][21][22][23][24][25] or by dehydration of precursor assemblies. [26][27][28] Several works have demonstrated the self-assembly of ZnO nanosheets under a surfactant-free onepot condition. [29][30][31][32][33][34] However, they were limited to the utilization of metal precursor, 29 diluted precursor solution and thus low yield of products, [30][31][32] or high-temperature (160-190 uC) solvothermal treatment, 29,33 and the underlying mechanism of the assembling process was poorly understood.…”

Photocatalytic Activity and Related Surface Properties of Transparent ZnO Films Prepared by a Low‐temperature Aqueous Route

“…It is reasonable to consider that not only ZnO but also high energy species such as Zn(OH) 2 (35) might exist on the surface of the ZnO crystals, which were not detected from XRD. In fact, several researchers reported the formation of Zn(OH) 2 under adequate concentration of citric ions in precursor solutions (36,37). It might be caused by change in the configuration between the zinc ions and ligands such as hydroxides and ammonium molecules.…”

Morphology-Dependent Room-Temperature Ferromagnetism in Undoped ZnO Nanostructures

“…HYT [102] has been developed to grow Zn 5 (OH) 8 Ac 2 •2H 2 O microspheres. In fact, the microspheres are grown from the nanosheets, which are curved and connected to each other.…”

“…This promoted search for DMS based on alternative dopants. Manifestation of RTFM has also been undertaken by doping with non-magnetic dopants such as H [26,[98][99][100][101][102][103][104][105][106][107][108][109][110]124,125], N [126,127], C [128][129][130][131], and S [47,78]. Interestingly, the observation of RTFM strongly suggests the presence of a spin-split band with a non-zero spin-orbit coupling in H-ZnO single crystals [100].…”