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Patterning two-dimensional free-standing surfaces with mesoporous conducting polymers.

Liu S, Gordiichuk P, Wu ZS, Liu Z, Wei W, Wagner M, Mohamed-Noriega N, Wu D, Mai Y, Herrmann A, Müllen K, Feng X - Nat Commun (2015)

Bottom Line: Although two-dimensional surfaces can serve as attractive platforms, direct patterning them in solution with regular arrays remains a major challenge.This strategy allows for bottom-up patterning of polypyrrole and polyaniline with adjustable mesopores on various functional free-standing surfaces, including two-dimensional graphene, molybdenum sulfide, titania nanosheets and even on one-dimensional carbon nanotubes.As exemplified by graphene oxide-based mesoporous polypyrrole nanosheets, the unique sandwich structure with adjustable pore sizes (5-20 nm) and thickness (35-45 nm) as well as enlarged specific surface area (85 m(2) g(-1)) provides excellent specific capacitance and rate performance for supercapacitors.

View Article: PubMed Central - PubMed

Affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, China.

ABSTRACT
The ability to pattern functional moieties with well-defined architectures is highly important in material science, nanotechnology and bioengineering. Although two-dimensional surfaces can serve as attractive platforms, direct patterning them in solution with regular arrays remains a major challenge. Here we develop a versatile route to pattern two-dimensional free-standing surfaces in a controlled manner assisted by monomicelle close-packing assembly of block copolymers, which is unambiguously revealed by direct visual observation. This strategy allows for bottom-up patterning of polypyrrole and polyaniline with adjustable mesopores on various functional free-standing surfaces, including two-dimensional graphene, molybdenum sulfide, titania nanosheets and even on one-dimensional carbon nanotubes. As exemplified by graphene oxide-based mesoporous polypyrrole nanosheets, the unique sandwich structure with adjustable pore sizes (5-20 nm) and thickness (35-45 nm) as well as enlarged specific surface area (85 m(2) g(-1)) provides excellent specific capacitance and rate performance for supercapacitors. Therefore, this approach will shed light on developing solution-based soft patterning of given interfaces towards bespoke functions.

No MeSH data available.


Related in: MedlinePlus

Electrochemical performance of 2D large-pore mesoporous mPPy@GO nanosheets.(a) CV curves of mPPy@GO nanosheets synthesized by PS38-b-PEO114 as electrodes at different scan rates, (b) comparison of specific capacitance versus scan rate for mPPy@GO-1 (5.8 nm), mPPy@GO-2 (13.2 nm), mPPy@GO-3 (19.2 nm) and mPPy@GO nanosheet electrode materials and (c) Electrochemical cycling stability of mPPy@GO-1, 2 and 3 and mPPy@GO nanosheet electrode materials at a high scan rate of 50 mV s−1. (d) Photograph of the on-chip all solid-state mPPy@GO micro-supercapacitors with in-plane geometry. (e–i) CV curves of mPPy@GO-3 nanosheets as electrodes for micro-supercapacitor at scan rates from 0.01 to 100 V s−1.
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f5: Electrochemical performance of 2D large-pore mesoporous mPPy@GO nanosheets.(a) CV curves of mPPy@GO nanosheets synthesized by PS38-b-PEO114 as electrodes at different scan rates, (b) comparison of specific capacitance versus scan rate for mPPy@GO-1 (5.8 nm), mPPy@GO-2 (13.2 nm), mPPy@GO-3 (19.2 nm) and mPPy@GO nanosheet electrode materials and (c) Electrochemical cycling stability of mPPy@GO-1, 2 and 3 and mPPy@GO nanosheet electrode materials at a high scan rate of 50 mV s−1. (d) Photograph of the on-chip all solid-state mPPy@GO micro-supercapacitors with in-plane geometry. (e–i) CV curves of mPPy@GO-3 nanosheets as electrodes for micro-supercapacitor at scan rates from 0.01 to 100 V s−1.

Mentions: Due to their unique sandwich structure and regular mesoporous array, the obtained mesoporous nanosheets are expected to serve as a novel class of promising electrode materials for various electrochemical applications. As a proof of concept, we evaluated the electrochemical properties of the synthesized GO-based mesoporous PPy nanosheets (mPPy@GO) with mesopore sizes of 5.8, 13.2 and 19.3 nm (denoted as mPPy@GO-1, mPPy@GO-2 and mPPy@GO-3, respectively) as electrodes in supercapacitors. Their performance was compared with that of PPy@GO nanosheets without mesoporous structures (Supplementary Fig. 6c). Figure 5a presents the cyclic voltammetry (CV) curves of the mPPy@GO-1 nanosheets. It is clear that the CV curves exhibit the typical pseudocapacitive behaviour of PPy with strong redox peaks in the range of −0.2 to 0.8 V at low scan rates of 1 mV s−1. Similar results were also observed for mPPy@GO-2 and mPPy@GO-3. At the same scan rates, all of the tested mesoporous mPPy@GO nanosheets exhibit much higher current densities and CV curve areas than that of the PPy@GO nanosheets (Fig. 5; Supplementary Fig. 13), suggesting that the presence of mesopores in mPPy@GO nanosheets would be extremely beneficial for the enhancement of the electrochemically capacitive behaviour.


Patterning two-dimensional free-standing surfaces with mesoporous conducting polymers.

Liu S, Gordiichuk P, Wu ZS, Liu Z, Wei W, Wagner M, Mohamed-Noriega N, Wu D, Mai Y, Herrmann A, Müllen K, Feng X - Nat Commun (2015)

Electrochemical performance of 2D large-pore mesoporous mPPy@GO nanosheets.(a) CV curves of mPPy@GO nanosheets synthesized by PS38-b-PEO114 as electrodes at different scan rates, (b) comparison of specific capacitance versus scan rate for mPPy@GO-1 (5.8 nm), mPPy@GO-2 (13.2 nm), mPPy@GO-3 (19.2 nm) and mPPy@GO nanosheet electrode materials and (c) Electrochemical cycling stability of mPPy@GO-1, 2 and 3 and mPPy@GO nanosheet electrode materials at a high scan rate of 50 mV s−1. (d) Photograph of the on-chip all solid-state mPPy@GO micro-supercapacitors with in-plane geometry. (e–i) CV curves of mPPy@GO-3 nanosheets as electrodes for micro-supercapacitor at scan rates from 0.01 to 100 V s−1.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4660032&req=5

f5: Electrochemical performance of 2D large-pore mesoporous mPPy@GO nanosheets.(a) CV curves of mPPy@GO nanosheets synthesized by PS38-b-PEO114 as electrodes at different scan rates, (b) comparison of specific capacitance versus scan rate for mPPy@GO-1 (5.8 nm), mPPy@GO-2 (13.2 nm), mPPy@GO-3 (19.2 nm) and mPPy@GO nanosheet electrode materials and (c) Electrochemical cycling stability of mPPy@GO-1, 2 and 3 and mPPy@GO nanosheet electrode materials at a high scan rate of 50 mV s−1. (d) Photograph of the on-chip all solid-state mPPy@GO micro-supercapacitors with in-plane geometry. (e–i) CV curves of mPPy@GO-3 nanosheets as electrodes for micro-supercapacitor at scan rates from 0.01 to 100 V s−1.
Mentions: Due to their unique sandwich structure and regular mesoporous array, the obtained mesoporous nanosheets are expected to serve as a novel class of promising electrode materials for various electrochemical applications. As a proof of concept, we evaluated the electrochemical properties of the synthesized GO-based mesoporous PPy nanosheets (mPPy@GO) with mesopore sizes of 5.8, 13.2 and 19.3 nm (denoted as mPPy@GO-1, mPPy@GO-2 and mPPy@GO-3, respectively) as electrodes in supercapacitors. Their performance was compared with that of PPy@GO nanosheets without mesoporous structures (Supplementary Fig. 6c). Figure 5a presents the cyclic voltammetry (CV) curves of the mPPy@GO-1 nanosheets. It is clear that the CV curves exhibit the typical pseudocapacitive behaviour of PPy with strong redox peaks in the range of −0.2 to 0.8 V at low scan rates of 1 mV s−1. Similar results were also observed for mPPy@GO-2 and mPPy@GO-3. At the same scan rates, all of the tested mesoporous mPPy@GO nanosheets exhibit much higher current densities and CV curve areas than that of the PPy@GO nanosheets (Fig. 5; Supplementary Fig. 13), suggesting that the presence of mesopores in mPPy@GO nanosheets would be extremely beneficial for the enhancement of the electrochemically capacitive behaviour.

Bottom Line: Although two-dimensional surfaces can serve as attractive platforms, direct patterning them in solution with regular arrays remains a major challenge.This strategy allows for bottom-up patterning of polypyrrole and polyaniline with adjustable mesopores on various functional free-standing surfaces, including two-dimensional graphene, molybdenum sulfide, titania nanosheets and even on one-dimensional carbon nanotubes.As exemplified by graphene oxide-based mesoporous polypyrrole nanosheets, the unique sandwich structure with adjustable pore sizes (5-20 nm) and thickness (35-45 nm) as well as enlarged specific surface area (85 m(2) g(-1)) provides excellent specific capacitance and rate performance for supercapacitors.

View Article: PubMed Central - PubMed

Affiliation: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, China.

ABSTRACT
The ability to pattern functional moieties with well-defined architectures is highly important in material science, nanotechnology and bioengineering. Although two-dimensional surfaces can serve as attractive platforms, direct patterning them in solution with regular arrays remains a major challenge. Here we develop a versatile route to pattern two-dimensional free-standing surfaces in a controlled manner assisted by monomicelle close-packing assembly of block copolymers, which is unambiguously revealed by direct visual observation. This strategy allows for bottom-up patterning of polypyrrole and polyaniline with adjustable mesopores on various functional free-standing surfaces, including two-dimensional graphene, molybdenum sulfide, titania nanosheets and even on one-dimensional carbon nanotubes. As exemplified by graphene oxide-based mesoporous polypyrrole nanosheets, the unique sandwich structure with adjustable pore sizes (5-20 nm) and thickness (35-45 nm) as well as enlarged specific surface area (85 m(2) g(-1)) provides excellent specific capacitance and rate performance for supercapacitors. Therefore, this approach will shed light on developing solution-based soft patterning of given interfaces towards bespoke functions.

No MeSH data available.


Related in: MedlinePlus