Ultrathin-Walled 3D Inorganic Nanostructured Networks Templated from Cross-Linked Cellulose Nanocrystal Aerogels

Arto Hiltunen, Tyler Or, Kimmo Lahtonen, Harri Ali-Löytty, Nikolai Tkachenko, Mika Valden, Essi Sarlin, Emily D. Cranston, Jose M. Moran-Mirabal, Jaana Vapaavuori*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A key challenge in the development of materials for applications in the fields of opto- and nanoelectronics, catalysis, separation, and energy conversion is the ability to fabricate 3D inorganic semiconductive nanostructures in a precisely-controlled and cost-effective manner. This work describes the fabrication of 3D nanostructured TiO2 monoliths by coating ultraporous cross-linked cellulose nanocrystal (CNC) aerogel templates with TiO2 layers of controlled thickness via atomic layer deposition (ALD). Following calcination, the resulting hollow inorganic ultraporous 3D networks form the thinnest self-supporting semiconductive structure (7 nm) fabricated directly on a conductive substrate. The CNC-templated ALD–TiO2 electrodes are applied toward photoelectrochemical water splitting. The results show that a TiO2 coating as thin as 15 nm produces a maximum water splitting efficiency, resulting in materials savings and reduced fabrication time.

Original languageEnglish
Article number2001181
Number of pages6
JournalAdvanced Materials Interfaces
Volume8
Issue number11
Early online date7 May 2021
DOIs
Publication statusPublished - 9 Jun 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • 3D network structure
  • atomic layer deposition
  • nanocellulose
  • templating
  • water splitting

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