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A Highly Efficient Sensor Platform Using Simply Manufactured Nanodot Patterned Substrates.

Rasappa S, Ghoshal T, Borah D, Senthamaraikannan R, Holmes JD, Morris MA - Sci Rep (2015)

Bottom Line: Highly dense iron oxide nanodots arrays that mimicked the original BCP pattern were prepared by an 'insitu' BCP inclusion methodology using poly(styrene)-block-poly(ethylene oxide) (PS-b-PEO).The dual detection of EtOH and H2O2 was clearly observed.The as-prepared nanodots have good long term thermal and chemical stability at the substrate and demonstrate promising electrocatalytic performance.

View Article: PubMed Central - PubMed

Affiliation: Materials Research Group, Department of Chemistry and Tyndall National Institute, University College Cork, Cork, Ireland.

ABSTRACT
Block copolymer (BCP) self-assembly is a low-cost means to nanopattern surfaces. Here, we use these nanopatterns to directly print arrays of nanodots onto a conducting substrate (Indium Tin Oxide (ITO) coated glass) for application as an electrochemical sensor for ethanol (EtOH) and hydrogen peroxide (H2O2) detection. The work demonstrates that BCP systems can be used as a highly efficient, flexible methodology for creating functional surfaces of materials. Highly dense iron oxide nanodots arrays that mimicked the original BCP pattern were prepared by an 'insitu' BCP inclusion methodology using poly(styrene)-block-poly(ethylene oxide) (PS-b-PEO). The electrochemical behaviour of these densely packed arrays of iron oxide nanodots fabricated by two different molecular weight PS-b-PEO systems was studied. The dual detection of EtOH and H2O2 was clearly observed. The as-prepared nanodots have good long term thermal and chemical stability at the substrate and demonstrate promising electrocatalytic performance.

No MeSH data available.


Spectroscopic characterization of Fe3O4 dots.(a) XPS data, (b) ATR-FTIR, (c) Raman analysis and (d) EDX data. See test for details.
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f4: Spectroscopic characterization of Fe3O4 dots.(a) XPS data, (b) ATR-FTIR, (c) Raman analysis and (d) EDX data. See test for details.

Mentions: XPS was used to confirm the crystalline phase and surface composition of the as-formed nanodots. Figure 4a shows high resolution Fe2p core level spectra (pass energy = 20 eV) of iron oxide nanodots prepared after UV/Ozone treatment. The data consists of two peaks associated with signals due to Fe 2p3/2 at 711 eV and Fe 2p1/2 at 724.4 eV. Both features are broadened due to the existence of both Fe2+ and Fe3+ ions2223. The Fe 2p3/2 and Fe 2p1/2 binding energies (BEs) for Fe2+ and Fe3+ were determined by curve-fitting using Gaussian-Lorentzian line shapes. The measured Fe 2p3/2 and Fe 2p1/2 BEs are 709.7 and 723 eV (assigned to Fe2+) and 711.6 and 725 eV (Fe3+) are consistent with literature values for these species2223. The ratio of Fe3+/Fe2+ was calculated from the curve-fitted peak areas as about 2:1 as expected for Fe3O4 and it is suggested this is the predominant phase present.


A Highly Efficient Sensor Platform Using Simply Manufactured Nanodot Patterned Substrates.

Rasappa S, Ghoshal T, Borah D, Senthamaraikannan R, Holmes JD, Morris MA - Sci Rep (2015)

Spectroscopic characterization of Fe3O4 dots.(a) XPS data, (b) ATR-FTIR, (c) Raman analysis and (d) EDX data. See test for details.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4542519&req=5

f4: Spectroscopic characterization of Fe3O4 dots.(a) XPS data, (b) ATR-FTIR, (c) Raman analysis and (d) EDX data. See test for details.
Mentions: XPS was used to confirm the crystalline phase and surface composition of the as-formed nanodots. Figure 4a shows high resolution Fe2p core level spectra (pass energy = 20 eV) of iron oxide nanodots prepared after UV/Ozone treatment. The data consists of two peaks associated with signals due to Fe 2p3/2 at 711 eV and Fe 2p1/2 at 724.4 eV. Both features are broadened due to the existence of both Fe2+ and Fe3+ ions2223. The Fe 2p3/2 and Fe 2p1/2 binding energies (BEs) for Fe2+ and Fe3+ were determined by curve-fitting using Gaussian-Lorentzian line shapes. The measured Fe 2p3/2 and Fe 2p1/2 BEs are 709.7 and 723 eV (assigned to Fe2+) and 711.6 and 725 eV (Fe3+) are consistent with literature values for these species2223. The ratio of Fe3+/Fe2+ was calculated from the curve-fitted peak areas as about 2:1 as expected for Fe3O4 and it is suggested this is the predominant phase present.

Bottom Line: Highly dense iron oxide nanodots arrays that mimicked the original BCP pattern were prepared by an 'insitu' BCP inclusion methodology using poly(styrene)-block-poly(ethylene oxide) (PS-b-PEO).The dual detection of EtOH and H2O2 was clearly observed.The as-prepared nanodots have good long term thermal and chemical stability at the substrate and demonstrate promising electrocatalytic performance.

View Article: PubMed Central - PubMed

Affiliation: Materials Research Group, Department of Chemistry and Tyndall National Institute, University College Cork, Cork, Ireland.

ABSTRACT
Block copolymer (BCP) self-assembly is a low-cost means to nanopattern surfaces. Here, we use these nanopatterns to directly print arrays of nanodots onto a conducting substrate (Indium Tin Oxide (ITO) coated glass) for application as an electrochemical sensor for ethanol (EtOH) and hydrogen peroxide (H2O2) detection. The work demonstrates that BCP systems can be used as a highly efficient, flexible methodology for creating functional surfaces of materials. Highly dense iron oxide nanodots arrays that mimicked the original BCP pattern were prepared by an 'insitu' BCP inclusion methodology using poly(styrene)-block-poly(ethylene oxide) (PS-b-PEO). The electrochemical behaviour of these densely packed arrays of iron oxide nanodots fabricated by two different molecular weight PS-b-PEO systems was studied. The dual detection of EtOH and H2O2 was clearly observed. The as-prepared nanodots have good long term thermal and chemical stability at the substrate and demonstrate promising electrocatalytic performance.

No MeSH data available.