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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.


Top-down SEM images of iron oxide nanodots before (a,c) and after electrochemical (b,d) analysis. Data from ALW are shown in (a,b) and corresponding data for BHW in (c,d) respectively.
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f3: Top-down SEM images of iron oxide nanodots before (a,c) and after electrochemical (b,d) analysis. Data from ALW are shown in (a,b) and corresponding data for BHW in (c,d) respectively.

Mentions: The selective inclusion of iron into the nanoporous template is a direct result of the hydrophobic nature of PS. Figure 3a,c show SEM images of well-ordered iron oxide nanodots arrays formed after precursor inclusion followed by UV/Ozone treatment for ALW and BHW. The nanodots have uniform size, shape and their placement mimics the original self-assembled BCP patterns. The average diameters of the nanodots were 18 (ALW) and 24 nm (BLW) when a 0.4 wt% iron precursor solution was used. The average heights of the nanodots were in the range of 6–9 nm as measured by ellipsometry. The density of the nanodots on the substrate is measured approximately 1.1 × 1011 and 4.2 × 1010 nanodots cm−2 for ALW and BHW respectively. The stability and attachment of the nanodots were examined after repeated electrochemical testing in solutions containing H2O2 and EtOH for 2 h. Figure 3b,d show SEM images following use indicate little, if any, change in the nanodot arrangements and indicate the robustness of these samples in this application. Further evidence of this robustness is detailed below.


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)

Top-down SEM images of iron oxide nanodots before (a,c) and after electrochemical (b,d) analysis. Data from ALW are shown in (a,b) and corresponding data for BHW in (c,d) respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Top-down SEM images of iron oxide nanodots before (a,c) and after electrochemical (b,d) analysis. Data from ALW are shown in (a,b) and corresponding data for BHW in (c,d) respectively.
Mentions: The selective inclusion of iron into the nanoporous template is a direct result of the hydrophobic nature of PS. Figure 3a,c show SEM images of well-ordered iron oxide nanodots arrays formed after precursor inclusion followed by UV/Ozone treatment for ALW and BHW. The nanodots have uniform size, shape and their placement mimics the original self-assembled BCP patterns. The average diameters of the nanodots were 18 (ALW) and 24 nm (BLW) when a 0.4 wt% iron precursor solution was used. The average heights of the nanodots were in the range of 6–9 nm as measured by ellipsometry. The density of the nanodots on the substrate is measured approximately 1.1 × 1011 and 4.2 × 1010 nanodots cm−2 for ALW and BHW respectively. The stability and attachment of the nanodots were examined after repeated electrochemical testing in solutions containing H2O2 and EtOH for 2 h. Figure 3b,d show SEM images following use indicate little, if any, change in the nanodot arrangements and indicate the robustness of these samples in this application. Further evidence of this robustness is detailed below.

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.