Fabrication and Characterization of Micro-Pattern Dandelion-like and Nanobelts of -SrV2O6 via Hydrothermal Process

Abstract

Dandelion-like micro-crystallites and long belt-like nanostructures of Sr-V-O materials were synthesized under mild hydrothermal reaction conditions in the presence of mineralizer adipic acid at 220C for 60 h and 180C for 60 h, respectively. Scanning electron microscopy measurements show that the Sr-V-O micro-crystallites in general consist of well-arranged microrods with the average length of a few hundred micrometers and diameters ranging from 1 um to 5 m. The long belt-like nanostructures around 100 nm in width exhibit visible twist and waving in shapes, showing high flexibility in nature. Powder X-ray diffraction and electron diffraction measurements both revealed that these micro-/nanometer materials have an orthorhombic structure with the lattice parameter a=9.694 A, b=3.687 A, and c=12.570 A (space group of Pnma) as reported for -SrV2O6 phase. The electron diffraction patterns also indicate that the micro-/nanometer -SrV2O6 crystallites preferentially grow along the 010 crystallographic direction. The effects of the hydrothermal treating temperature and chemical compositions ratio of Sr to V on the morphologies of the final products are extensively investigated. A possible crystallite growth mechanism for the micro-pattern formation is proposed based on the systematic analysis of the experiental results.

Less-Common Nanostructures in the Forms of Vegetation

“…Dandelion-like microcrystallites and long belt-like nanostructures of Sr-V-O materials (β-SrV 2 O 6 ) were synthesized under mild hydrothermal reaction conditions in the presence of mineralizer adipic acid at 220 °C for 60 h and 180 °C for 60 h, respectively. 196 SrCO 3 dandelion-like architectures of 5-10 µm were prepared by an aqueous solution route at room temperature using SrCl 2 , Na 2 CrO 4 , and NaOH as the starting reaction reagents and distilled water as the solvent. 197 The growth process of SrCO 3 architectures, suggested by the authors as "rod to dumbbell to sphere" growth mechanism, involved the growth of single-crystalline SrCrO 4 nanowires (reaction 17), the formation of CO 3 2-ions through the reaction between CO 2 gas from air and aqueous NaOH solution (reaction 18), and finally the formation of SrCO 3 architectures through the reaction between SrCrO 4 and CO 3 2ions (reactions 19 and 20).…”

“…Dandelion-like microcrystallites and long belt-like nanostructures of Sr−V−O materials (β-SrV 2 O 6 ) were synthesized under mild hydrothermal reaction conditions in the presence of mineralizer adipic acid at 220 °C for 60 h and 180 °C for 60 h, respectively . SrCO 3 dandelion-like architectures of 5−10 μm were prepared by an aqueous solution route at room temperature using SrCl 2 , Na 2 CrO 4 , and NaOH as the starting reaction reagents and distilled water as the solvent .…”

A selective electrochemical sensor for caffeic acid and photocatalyst for metronidazole drug pollutant - A dual role by rod-like SrV2O6

“…No other extra peaks were detected related to the SrO 2 and V 2 O 5 , which suggested that high phase purity and the sharp peaks revealed the good crystalline nature of SrV 2 O 6 . From the XRD results, the as-synthesized SrV 2 O 6 is in β-SrV 2 O 6 40 . Raman spectroscopy is an effective technique to analyze the bonding states and local structure of the as-synthesized rod-like SrV 2 O 6 as it shown in Fig.…”

“…In particularly, strontium based vanadates has considerable attention due to their optical, and electrical properties which can be used as an variety of applications including gas sensors, solid state electrolytes, lithium-ion batteries, electrochemical sensor and photocatalyst 35 , 36 . There are several types of mixed oxides based on strontium and vanadium such as SrVO 3 , Sr 3 V 2 O 8 , Sr 2 V 2 O 7 , Sr 3 (VO 4 ) 2 and SrV 2 O 6 have been reported 37 – 40 . However, the electrochemical and photocatalytic properties of SrV 2 O 6 phase reports are scarce until now.…”

“…However, the electrochemical and photocatalytic properties of SrV 2 O 6 phase reports are scarce until now. Recently, Z. Li et al ., reported dandelion-like micro-crystallites and long belt-like nanostructures of SrV 2 O 6 phase synthesized by hydrothermal method in the presence of adipic acid 40 . It is well known that the interesting photocatalytic and electrochemical behaviors mainly dependent on its morphologies and crystalline nature 41 , 42 .…”