Understanding the Origin of Ferromagnetism in ZnO Porous Microspheres by Systematic Investigations of the Thermal Decomposition of Zn₅(OH)₈Ac₂·2H₂O to ZnO

Abstract

In this paper, thermogravimetric analyses, Fourier transform infrared spectra, X-ray powder diffraction, photoluminescence, electron paramagnetic resonance, and superconducting quantum interference device magnetometer are applied to observe the thermal decomposition of Zn5(OH)8Ac2·2H2O to ZnO for understanding the origin of room temperature ferromagnetism in ZnO porous microspheres. The results show that both zinc vacancies and shallow donors induced by hydrogen may play an important role in triggering magnetic order in ZnO samples fabricated by annealing the precursor Zn5(OH)8Ac2·2H2O at temperature above 400 °C.

Peptide-directed crystal growth modification in the formation of ZnO

“…25,29 Total weight loss values of 31-38% have been reported for LBZA in the literature. 26,29,31,37 In this study, the weight losses observed in the presence of 0.2 mM EM-12 and above, supported the presence of LBZA in the samples (Fig. 2b).…”

Nanošenje fotokatalitičkih ZnO slojeva na podloge različite geometrije

“…layered basic zinc acetate, LBZA), koji zatim žarenjem prelazi u ZnO zadržavajući listićavu morfologiju LBZA. [5][6][7][8][9][10] Hidrotermalna sinteza alternativni je pristup pripravi slojeva sličnih morfologija, [11][12][13][14] no preliminarna istraživanja pokazuju da su takvi slojevi vrlo prhki i znatno slabije vezani na nemodificiranu podlogu od slojeva iz metanolne otopine. Prethodno 15 su ustanovljeni optimalni uvjeti za dobivanje karakteristične cvjetaste morfologije ZnO.…”

Nanoplate-Built ZnO Hollow Microspheres Decorated with Gold Nanoparticles and Their Enhanced Photocatalytic and Gas-Sensing Properties

“…The details regarding the growth process of ZnO nanoplatebuilt hollow microspheres are similar to those reported in our previous study. 23 In a typical procedure, 10 mmol of Zn(CH 3 COO)·2H 2 O), 10 mmol of C 6 H 12 N 4 , and 1 mmol of C 6 H 5 Na 3 O 7 ·2H 2 O were dissolved in 100 mL of distilled water. The solution was then stirred for 30 min.…”