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Enhanced electrical properties in sub-10-nm WO3 nanoflakes prepared via a two-step sol-gel-exfoliation method.

Zhuiykov S, Kats E - Nanoscale Res Lett (2014)

Bottom Line: The morphology and electrical properties of orthorhombic β-WO3 nanoflakes with thickness of ~7 to 9 nm were investigated at the nanoscale with a combination of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), current sensing force spectroscopy atomic force microscopy (CSFS-AFM, or PeakForce TUNA™), Fourier transform infra-red absorption spectroscopy (FTIR), linear sweep voltammetry (LSV) and Raman spectroscopy techniques.CSFS-AFM analysis established good correlation between the topography of the developed nanostructures and various features of WO3 nanoflakes synthesized via a two-step sol-gel-exfoliation method.It was determined that β-WO3 nanoflakes annealed at 550°C possess distinguished and exceptional thickness-dependent properties in comparison with the bulk, micro and nanostructured WO3 synthesized at alternative temperatures.

View Article: PubMed Central - HTML - PubMed

Affiliation: Materials Science and Engineering Division, CSIRO, 37 Graham Road, Highett, VIC 3190, Australia.

ABSTRACT
The morphology and electrical properties of orthorhombic β-WO3 nanoflakes with thickness of ~7 to 9 nm were investigated at the nanoscale with a combination of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), current sensing force spectroscopy atomic force microscopy (CSFS-AFM, or PeakForce TUNA™), Fourier transform infra-red absorption spectroscopy (FTIR), linear sweep voltammetry (LSV) and Raman spectroscopy techniques. CSFS-AFM analysis established good correlation between the topography of the developed nanostructures and various features of WO3 nanoflakes synthesized via a two-step sol-gel-exfoliation method. It was determined that β-WO3 nanoflakes annealed at 550°C possess distinguished and exceptional thickness-dependent properties in comparison with the bulk, micro and nanostructured WO3 synthesized at alternative temperatures.

No MeSH data available.


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FTIR measurements for WO3 nanoflakes sintered at 550°C and 650°C. (A) Total IR spectra. (B) Perturbation region within 400 to 1,200 cm-1.
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Figure 6: FTIR measurements for WO3 nanoflakes sintered at 550°C and 650°C. (A) Total IR spectra. (B) Perturbation region within 400 to 1,200 cm-1.

Mentions: In situ FTIR spectroscopy of Q2D WO3 nanoflakes was utilized to determine surface chemistry and surface reactions of the developed crystalline nanostructures [36]. This is a very powerful technique particularly for elucidating changes in hydration and hydroxylation that occur on the surface of Q2D nanoflakes. The FTIR spectra for Q2D WO3 nanoflakes sintered at 550 and 650°C, respectively, are presented in Figure 6. They illustrate the bonding characteristics of the functional groups in the sol-gel prepared and exfoliated Q2D WO3. The higher surface area enables the detection of bands owing to surface OH and adsorbed water in the 3,700 to 3,100 cm-1 region (not shown in presented Figure 6). Specifically, the sharp peaks at 1,620 cm-1 are various O-H stretching modes due to H2O bending mode. Generally, about 40% of the total adsorbed water remains strongly bound to the surface up to 150°C [37]. Weak C-H stretching modes at 2,991 cm-1 were also observed.


Enhanced electrical properties in sub-10-nm WO3 nanoflakes prepared via a two-step sol-gel-exfoliation method.

Zhuiykov S, Kats E - Nanoscale Res Lett (2014)

FTIR measurements for WO3 nanoflakes sintered at 550°C and 650°C. (A) Total IR spectra. (B) Perturbation region within 400 to 1,200 cm-1.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4150682&req=5

Figure 6: FTIR measurements for WO3 nanoflakes sintered at 550°C and 650°C. (A) Total IR spectra. (B) Perturbation region within 400 to 1,200 cm-1.
Mentions: In situ FTIR spectroscopy of Q2D WO3 nanoflakes was utilized to determine surface chemistry and surface reactions of the developed crystalline nanostructures [36]. This is a very powerful technique particularly for elucidating changes in hydration and hydroxylation that occur on the surface of Q2D nanoflakes. The FTIR spectra for Q2D WO3 nanoflakes sintered at 550 and 650°C, respectively, are presented in Figure 6. They illustrate the bonding characteristics of the functional groups in the sol-gel prepared and exfoliated Q2D WO3. The higher surface area enables the detection of bands owing to surface OH and adsorbed water in the 3,700 to 3,100 cm-1 region (not shown in presented Figure 6). Specifically, the sharp peaks at 1,620 cm-1 are various O-H stretching modes due to H2O bending mode. Generally, about 40% of the total adsorbed water remains strongly bound to the surface up to 150°C [37]. Weak C-H stretching modes at 2,991 cm-1 were also observed.

Bottom Line: The morphology and electrical properties of orthorhombic β-WO3 nanoflakes with thickness of ~7 to 9 nm were investigated at the nanoscale with a combination of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), current sensing force spectroscopy atomic force microscopy (CSFS-AFM, or PeakForce TUNA™), Fourier transform infra-red absorption spectroscopy (FTIR), linear sweep voltammetry (LSV) and Raman spectroscopy techniques.CSFS-AFM analysis established good correlation between the topography of the developed nanostructures and various features of WO3 nanoflakes synthesized via a two-step sol-gel-exfoliation method.It was determined that β-WO3 nanoflakes annealed at 550°C possess distinguished and exceptional thickness-dependent properties in comparison with the bulk, micro and nanostructured WO3 synthesized at alternative temperatures.

View Article: PubMed Central - HTML - PubMed

Affiliation: Materials Science and Engineering Division, CSIRO, 37 Graham Road, Highett, VIC 3190, Australia.

ABSTRACT
The morphology and electrical properties of orthorhombic β-WO3 nanoflakes with thickness of ~7 to 9 nm were investigated at the nanoscale with a combination of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), current sensing force spectroscopy atomic force microscopy (CSFS-AFM, or PeakForce TUNA™), Fourier transform infra-red absorption spectroscopy (FTIR), linear sweep voltammetry (LSV) and Raman spectroscopy techniques. CSFS-AFM analysis established good correlation between the topography of the developed nanostructures and various features of WO3 nanoflakes synthesized via a two-step sol-gel-exfoliation method. It was determined that β-WO3 nanoflakes annealed at 550°C possess distinguished and exceptional thickness-dependent properties in comparison with the bulk, micro and nanostructured WO3 synthesized at alternative temperatures.

No MeSH data available.


Related in: MedlinePlus