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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 at different concentrations of EtOH (scan rate = 50 mV s−1). (b) Ip vs concentration of EtOH. (c) Multiple scanning (10 runs) of sample ALW in 0.1 M EtOH in same conditions.
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f11: (a) CV data showing the current response of sample ALW at different concentrations of EtOH (scan rate = 50 mV s−1). (b) Ip vs concentration of EtOH. (c) Multiple scanning (10 runs) of sample ALW in 0.1 M EtOH in same conditions.

Mentions: Figure 11a shows the CV of sample ALW modified electrode performances for varying EtOH concentrations of 0.02–1.0 M. The anodic peak current is linearly dependent on concentration (R2 = 0.9941) and varies from 25 to 60 mA (Fig. 11b). The detection limit was calculated as 5.52 mM and the sensitivity of sample ALW is 0.039 μA mM−1. A linear like current region was apparent for low EtOH concentrations which becomes sharper with increasing the concentration. This suggests that the mass transfer effect was eliminated for high EtOH concentrations (0.06–0.1 M) but it could not be eliminated for low EtOH concentrations (<0.04 M). Moreoever, at higher concentrations of EtOH ALW samples are very sensitive and so oxidation occurs even at lo potential than at lower concentrations. EtOH oxidation might be dominated by the kinetic effect (electron transfer) at high EtOH concentrations, and by mass transfer and electron transfer at low EtOH concentrations. Continuous CVs (50) of sample ALW in 0.1 M EtOH were preformed to test the long term use of these materials and are shown in Fig. 11c. As above, there was no measurable difference in data after 10 cycles and only the first and 10th cycles are shown for clarity. Less than 1% variation in peak currents was observed.


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 at different concentrations of EtOH (scan rate = 50 mV s−1). (b) Ip vs concentration of EtOH. (c) Multiple scanning (10 runs) of sample ALW in 0.1 M EtOH in same conditions.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f11: (a) CV data showing the current response of sample ALW at different concentrations of EtOH (scan rate = 50 mV s−1). (b) Ip vs concentration of EtOH. (c) Multiple scanning (10 runs) of sample ALW in 0.1 M EtOH in same conditions.
Mentions: Figure 11a shows the CV of sample ALW modified electrode performances for varying EtOH concentrations of 0.02–1.0 M. The anodic peak current is linearly dependent on concentration (R2 = 0.9941) and varies from 25 to 60 mA (Fig. 11b). The detection limit was calculated as 5.52 mM and the sensitivity of sample ALW is 0.039 μA mM−1. A linear like current region was apparent for low EtOH concentrations which becomes sharper with increasing the concentration. This suggests that the mass transfer effect was eliminated for high EtOH concentrations (0.06–0.1 M) but it could not be eliminated for low EtOH concentrations (<0.04 M). Moreoever, at higher concentrations of EtOH ALW samples are very sensitive and so oxidation occurs even at lo potential than at lower concentrations. EtOH oxidation might be dominated by the kinetic effect (electron transfer) at high EtOH concentrations, and by mass transfer and electron transfer at low EtOH concentrations. Continuous CVs (50) of sample ALW in 0.1 M EtOH were preformed to test the long term use of these materials and are shown in Fig. 11c. As above, there was no measurable difference in data after 10 cycles and only the first and 10th cycles are shown for clarity. Less than 1% variation in peak currents was observed.

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.