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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.


Related in: MedlinePlus

CV data showing the current response of sample ALW and sample BHW in the presence and absence of 2.5 μM H2O2 (phosphate buffer solution and scan rate = 50 mV s−1).
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f5: CV data showing the current response of sample ALW and sample BHW in the presence and absence of 2.5 μM H2O2 (phosphate buffer solution and scan rate = 50 mV s−1).

Mentions: Fe3O4 nanodot – ITO samples were used as an electrochemical sensor for H2O2 detection. Typical CVs (scan rate = 50 mVs−1 in a 0.5 M phosphate buffer solution (pH = 7.4)) for ALW and BHW samples in presence and absence of 2.5 μM H2O2 are shown in Fig. 5. Both samples behave passively in this buffer solution and indicate the electrostability of the modified substrates. When H2O2 was introduced into modified electrode, a steep increase in anodic current was observed. An positive potential oxidation peak at 0.35 and 0.323 V was observed for sample BHW and ALW samples respectively and is associated with the oxidation of Fe(II) into Fe(III). The electrochemical reaction mechanism of Fe3O4 with H2O2 sensing and the intermediate by-products formation can be described by the reactions31:


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)

CV data showing the current response of sample ALW and sample BHW in the presence and absence of 2.5 μM H2O2 (phosphate buffer solution and scan rate = 50 mV s−1).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: CV data showing the current response of sample ALW and sample BHW in the presence and absence of 2.5 μM H2O2 (phosphate buffer solution and scan rate = 50 mV s−1).
Mentions: Fe3O4 nanodot – ITO samples were used as an electrochemical sensor for H2O2 detection. Typical CVs (scan rate = 50 mVs−1 in a 0.5 M phosphate buffer solution (pH = 7.4)) for ALW and BHW samples in presence and absence of 2.5 μM H2O2 are shown in Fig. 5. Both samples behave passively in this buffer solution and indicate the electrostability of the modified substrates. When H2O2 was introduced into modified electrode, a steep increase in anodic current was observed. An positive potential oxidation peak at 0.35 and 0.323 V was observed for sample BHW and ALW samples respectively and is associated with the oxidation of Fe(II) into Fe(III). The electrochemical reaction mechanism of Fe3O4 with H2O2 sensing and the intermediate by-products formation can be described by the reactions31:

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.


Related in: MedlinePlus