Template-free microwave-assisted synthesis of ZnO hollow microspheres and their application in gas sensing

Solvothermal synthesis and enhanced CO 2 adsorption ability of mesoporous graphene oxide-ZnO nanocomposite

“…1b), all of the peaks could be assigned to pure sample with hexagonal structure according to JCPDS No. 36-1451 [7] with the lattice parameters of a=3.25 Å, and c=5.21 Å. The peaks of 2θ are clearly at 31.8, 34.8, 36.5, 48.0, A c c e p t e d M a n u s c r i p t 57.0, 63.4, 66.9, and 68.5, respectively.…”

“…[3][4][5] For example, some porous ZnO nanostructures have been prepared to investigate the ability on sensing CO 2 . [6][7][8][9] To be an excellent adsorbent of CO 2 , the factors of surface area, pore size and pore property are all important. Ainara Group reported a potential adsorbent of CO 2 by using GO as support for layered double hydroxides, and the nanocomposite showed great enhanced adsorption amount [9], that is because the functional groups of GO exhibit excellent affinity on CO 2 .…”

Trisodium citrate as bridging and suppressing agent to control synthesis of ZnO hollow hierarchical microspheres and their photocatalytic properties

“…In the initial stage, HMTA gradually hydrolyzes in the reaction solution and produces OH - [35,36]. Besides, there also exist some Zn(OH) 2 nanoclusters that not turn into ZnO (Figure 1a).…”

Facile template-free hydrothermal fabrication of ZnO hollow microspheres for gas sensing applications

“…To overcome these defects, 'one-pot' template-free synthesis methods have been intensely develope to fabricate numerous hollow structures with complicated morphologies and structures. For example, Wang et al have reported a solvothermal approach employing PEG 400 as the solvent to synthesize ZnO hollow microspheres self-assembled by a mass of nanoparticles [18], Yuan et al fabricated nanorod assembled ZnO hollow spheres formed through Ostwald ripening process by a one-pot solvothermal synthesis method [19], Sun et al developed a one-step solvothermal method to synthesize the hierarchically structured ZnO hollow spheres consisting of nanorods [20], Zeng et al developed a three-tiered organization of ZnO nano-building blocks into hollow spherical conformations by using CTAB as surfactant [21], Du et al synthesized ZnO hollow structures by a facile template-free microwave-assisted approach [22]. However, many 'one-pot' template-free synthesis methods need utilizing organics as main solvent, the addition of surfactants or the complicated equipments, which 4 could introduce some impurities bonded to the surface of ZnO and increase experiment cost .…”