Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites

Abstract The inherent scalability, low production cost and mechanical flexibility of laser-induced graphene (LIG) combined with its high electrical conductivity, hierarchical porosity and large surface area are appealing characteristics for many applications. Still, other materials can be combined w...

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Autores principales:	N. F. Santos, J. Rodrigues, S. O. Pereira, A. J. S. Fernandes, T. Monteiro, F. M. Costa
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/51e944241a3946519f4763839053db91
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spelling	oai:doaj.org-article:51e944241a3946519f4763839053db912021-12-02T19:02:27ZElectrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites10.1038/s41598-021-96305-82045-2322https://doaj.org/article/51e944241a3946519f4763839053db912021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96305-8https://doaj.org/toc/2045-2322Abstract The inherent scalability, low production cost and mechanical flexibility of laser-induced graphene (LIG) combined with its high electrical conductivity, hierarchical porosity and large surface area are appealing characteristics for many applications. Still, other materials can be combined with LIG to provide added functionalities and enhanced performance. This work exploits the most adequate electrodeposition parameters to produce LIG/ZnO nanocomposites. Low-temperature pulsed electrodeposition allowed the conformal and controlled deposition of ZnO rods deep inside the LIG pores whilst maintaining its inherent porosity, which constitute fundamental advances regarding other methods for LIG/ZnO composite production. Compared to bare LIG, the composites more than doubled electrode capacitance up to 1.41 mF cm−2 in 1 M KCl, while maintaining long-term cycle stability, low ohmic losses and swift electron transfer. The composites also display a luminescence band peaked at the orange/red spectral region, with the main excitation maxima at ~ 3.33 eV matching the expected for the ZnO bandgap at room temperature. A pronounced sub-bandgap tail of states with an onset absorption near 3.07 eV indicates a high amount of defect states, namely surface-related defects. This work shows that these environmentally sustainable multifunctional nanocomposites are valid alternatives for supercapacitors, electrochemical/optical biosensors and photocatalytic/photoelectrochemical devices.N. F. SantosJ. RodriguesS. O. PereiraA. J. S. FernandesT. MonteiroF. M. CostaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q N. F. Santos J. Rodrigues S. O. Pereira A. J. S. Fernandes T. Monteiro F. M. Costa Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites
description	Abstract The inherent scalability, low production cost and mechanical flexibility of laser-induced graphene (LIG) combined with its high electrical conductivity, hierarchical porosity and large surface area are appealing characteristics for many applications. Still, other materials can be combined with LIG to provide added functionalities and enhanced performance. This work exploits the most adequate electrodeposition parameters to produce LIG/ZnO nanocomposites. Low-temperature pulsed electrodeposition allowed the conformal and controlled deposition of ZnO rods deep inside the LIG pores whilst maintaining its inherent porosity, which constitute fundamental advances regarding other methods for LIG/ZnO composite production. Compared to bare LIG, the composites more than doubled electrode capacitance up to 1.41 mF cm−2 in 1 M KCl, while maintaining long-term cycle stability, low ohmic losses and swift electron transfer. The composites also display a luminescence band peaked at the orange/red spectral region, with the main excitation maxima at ~ 3.33 eV matching the expected for the ZnO bandgap at room temperature. A pronounced sub-bandgap tail of states with an onset absorption near 3.07 eV indicates a high amount of defect states, namely surface-related defects. This work shows that these environmentally sustainable multifunctional nanocomposites are valid alternatives for supercapacitors, electrochemical/optical biosensors and photocatalytic/photoelectrochemical devices.
format	article
author	N. F. Santos J. Rodrigues S. O. Pereira A. J. S. Fernandes T. Monteiro F. M. Costa
author_facet	N. F. Santos J. Rodrigues S. O. Pereira A. J. S. Fernandes T. Monteiro F. M. Costa
author_sort	N. F. Santos
title	Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites
title_short	Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites
title_full	Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites
title_fullStr	Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites
title_full_unstemmed	Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites
title_sort	electrochemical and photoluminescence response of laser-induced graphene/electrodeposited zno composites
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/51e944241a3946519f4763839053db91
work_keys_str_mv	AT nfsantos electrochemicalandphotoluminescenceresponseoflaserinducedgrapheneelectrodepositedznocomposites AT jrodrigues electrochemicalandphotoluminescenceresponseoflaserinducedgrapheneelectrodepositedznocomposites AT sopereira electrochemicalandphotoluminescenceresponseoflaserinducedgrapheneelectrodepositedznocomposites AT ajsfernandes electrochemicalandphotoluminescenceresponseoflaserinducedgrapheneelectrodepositedznocomposites AT tmonteiro electrochemicalandphotoluminescenceresponseoflaserinducedgrapheneelectrodepositedznocomposites AT fmcosta electrochemicalandphotoluminescenceresponseoflaserinducedgrapheneelectrodepositedznocomposites
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Electrochemical and photoluminescence response of laser-induced graphene/electrodeposited ZnO composites

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