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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.


CVs showing the current response of sample ALW in 0.1 M EtOH at various scan rates.(b) Ip vs 1/2 for anodic process. (c) Tafel plot of Ep vs log  for the anodic process.
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f10: CVs showing the current response of sample ALW in 0.1 M EtOH at various scan rates.(b) Ip vs 1/2 for anodic process. (c) Tafel plot of Ep vs log for the anodic process.

Mentions: Figure 10a shows CV data of EtOH oxidation (sample ALW, 0.1 M EtOH) at various scan rates from 10 mV s−1 to 150 mV s−1. Figure 10b shows the plot of the anodic peak current Ipvs1/2 (see Equation (1)) and good linear dependence was observed (R2 = 0.9987). The reductive peak current behaved similarly. These data suggest that direct electron transfer between EtOH and the modified electrode surface occurs as shown in Fig. 10. Note that no intersection of anodic-cathodic current was observed for any of the scan rates used indicating that even at the lowest scan rate of 10 mV s−1 all of the EtOH is oxidized in the forward scan. The stability of sample ALW was estimated at 324 mV dec−1 using Equation 2 and the Tefal plot data in Fig. 10c as described above. Note that the value of b estimated is lower than seen previously41 which suggests that poisoning of the electrode is negligible during the reaction mechanism. This is important because it reflects the resistance of this oxide to degradation due to impurities. The calculated value for the anodic transfer coefficient (α) is 0.81 for EtOH oxidation process.


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)

CVs showing the current response of sample ALW in 0.1 M EtOH at various scan rates.(b) Ip vs 1/2 for anodic process. (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

f10: CVs showing the current response of sample ALW in 0.1 M EtOH at various scan rates.(b) Ip vs 1/2 for anodic process. (c) Tafel plot of Ep vs log for the anodic process.
Mentions: Figure 10a shows CV data of EtOH oxidation (sample ALW, 0.1 M EtOH) at various scan rates from 10 mV s−1 to 150 mV s−1. Figure 10b shows the plot of the anodic peak current Ipvs1/2 (see Equation (1)) and good linear dependence was observed (R2 = 0.9987). The reductive peak current behaved similarly. These data suggest that direct electron transfer between EtOH and the modified electrode surface occurs as shown in Fig. 10. Note that no intersection of anodic-cathodic current was observed for any of the scan rates used indicating that even at the lowest scan rate of 10 mV s−1 all of the EtOH is oxidized in the forward scan. The stability of sample ALW was estimated at 324 mV dec−1 using Equation 2 and the Tefal plot data in Fig. 10c as described above. Note that the value of b estimated is lower than seen previously41 which suggests that poisoning of the electrode is negligible during the reaction mechanism. This is important because it reflects the resistance of this oxide to degradation due to impurities. The calculated value for the anodic transfer coefficient (α) is 0.81 for EtOH oxidation process.

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.