Mechanochemical synthesis of nanostructured Sr(Ti{sub 1-x}Fe{sub x})O{sub 3-{delta}} solid-solution powders and their surface photovoltage responses

Journal Article · Tue May 15 00:00:00 EDT 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2012.01.012· OSTI ID:22012108

Xiaofeng, Chen ^[1]; Qiong, Luo ^[1]; Han, Mandi ^[1]; Tse, Man Siu; Hui, Huang ^[1]

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1. Microelectronics Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore)

A series of nanostructure Sr(Ti{sub 1-x}Fe{sub x})O{sub 3-{delta}} (STFx, x=0.4, 0.6, 0.8) solid-solution powders were synthesized by mechanochemical approach milling from the mixture of SrO, Fe{sub 2}O{sub 3} and TiO{sub 2} metal oxides at room temperature. The XRD results revealed that the perovskite STFx nanoparticles were finally formed with few residual {alpha}-Fe{sub 2}O{sub 3} detected dependent on the milling conditions. The structure evolution suggested that the mechanochemical synthesis underwent via a solid-state reaction route to initially form Ti-rich perovskite and then incorporate with the residual {alpha}-Fe{sub 2}O{sub 3} to achieve the estimated composition. The synthesized STF08 powders exhibited the significant Surface Photovoltage (SPV) spectrum response both in UV and in visible-light region with p-type semiconductor behavior. This finding suggested that the synthesized STF nanopowders could potentially utilize more solar spectrum energy effectively for photo-oxidation and photo-catalysis applications. - Graphical abstract: It is demonstrated that Sr(Ti{sub 1-x}Fe{sub x})O{sub 3-{delta}} perovskite nanopowders were successfully synthesized by mechanochemical reaction approach at room temerpature, and the synthesized STF08 powders showed the significant SPV response in UV-VIS region with p-type semiconductor behaviors. Highlights: Black-Right-Pointing-Pointer Sr(Ti{sub 1-x}Fe{sub x})O{sub 3-{delta}} nanopowders synthesized by mechanochemical reaction approach. Black-Right-Pointing-Pointer The reaction process was shorten by introduce high impact energy. Black-Right-Pointing-Pointer Synthesized STF08 powders show the significant SPV response in UV-VIS region. Black-Right-Pointing-Pointer Synthesized STFx powders show p-type semiconductor behaviors.

• OSTI ID: 22012108
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. . 189; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CATALYSIS
FERRITES
IRON OXIDES
MILLING
NANOSTRUCTURES
OXIDATION
PARTICLES
PEROVSKITE
POWDERS
PROBES
SEMICONDUCTOR MATERIALS
SOLID SOLUTIONS
SOLIDS
SPECTRA
STRONTIUM OXIDES
SURFACES
SYNTHESIS
TITANIUM OXIDES
X-RAY DIFFRACTION