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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.


(a) CV data showing the current response of sample ALW (2.5 μM H2O2, phosphate buffer solution) at various scan rates. (b) Ip vs 1/2 and (c) Tafel plot of Ep vs log  for the anodic process.
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f6: (a) CV data showing the current response of sample ALW (2.5 μM H2O2, phosphate buffer solution) at various scan rates. (b) Ip vs 1/2 and (c) Tafel plot of Ep vs log for the anodic process.

Mentions: Figure 6a illustrates typical CV data from sample ALW recorded at scan rates of 10, 50 and 100 mVs−1 in the presence of H2O2. As might be expected, increasing scan rate results in sharper features and increased anodic peak currents from 1.7 mA to 3.0 mA. The proportionality of the peak current to the scan rate indicates a diffusion controlled electrochemical process. The diffusional charge transport is determined by ion transport or electron self-exchange in the Fe3+ and Fe2+ redox couple in Fe3O4. The motion of counter ions is required for electroneutrality and rapid electron transfer is generally favoured by the high redox site concentration34. The characteristics of the redox process can be ascertained from the Randles-Sevčik equation (Equation 1)20 by plotting peak current, Ip, against (1/2) where is the scan rate:


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)

(a) CV data showing the current response of sample ALW (2.5 μM H2O2, phosphate buffer solution) at various scan rates. (b) Ip vs 1/2 and (c) Tafel plot of Ep vs log  for the anodic process.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6: (a) CV data showing the current response of sample ALW (2.5 μM H2O2, phosphate buffer solution) at various scan rates. (b) Ip vs 1/2 and (c) Tafel plot of Ep vs log for the anodic process.
Mentions: Figure 6a illustrates typical CV data from sample ALW recorded at scan rates of 10, 50 and 100 mVs−1 in the presence of H2O2. As might be expected, increasing scan rate results in sharper features and increased anodic peak currents from 1.7 mA to 3.0 mA. The proportionality of the peak current to the scan rate indicates a diffusion controlled electrochemical process. The diffusional charge transport is determined by ion transport or electron self-exchange in the Fe3+ and Fe2+ redox couple in Fe3O4. The motion of counter ions is required for electroneutrality and rapid electron transfer is generally favoured by the high redox site concentration34. The characteristics of the redox process can be ascertained from the Randles-Sevčik equation (Equation 1)20 by plotting peak current, Ip, against (1/2) where is the scan rate:

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.