Fiche publication
Date publication
mai 2017
Journal
ACS applied materials & interfaces
Auteurs
Membres identifiés du Cancéropôle Est :
Dr PICAUD Fabien
Tous les auteurs :
Weber M, Koonkaew B, Balme S, Utke I, Picaud F, Iatsunskyi I, Coy E, Miele P, Bechelany M
Lien Pubmed
Résumé
In this work, we report the design and the fine-tuning of boron nitride single nanopore and nanoporous membranes by atomic layer deposition (ALD). First, we developed an ALD process based on the use of BBr and NH as precursors in order to synthesize BN thin films. The deposited films were characterized in terms of thickness, composition, and microstructure. Next, we used the newly developed process to grow BN films on anodic aluminum oxide nanoporous templates, demonstrating the conformality benefit of BN prepared by ALD, and its scalability for the manufacturing of membranes. For the first time, the ALD process was then used to tune the diameter of fabricated single transmembrane nanopores by adjusting the BN thickness and to enable studies of the fundamental aspects of ionic transport on a single nanopore. At pH = 7, we estimated a surface charge density of 0.16 C·m without slip and 0.07 C·m considering a reasonable slip length of 3 nm. Molecular dynamics simulations performed with experimental conditions confirmed the conductivities and the sign of surface charges measured. The high ion transport results obtained and the ability to fine-tune nanoporous membranes by such a scalable method pave the way toward applications such as ionic separation, energy harvesting, and ultrafiltration devices.
Mots clés
atomic layer deposition, boron nitride, membrane, nanotechnology, surface charge
Référence
ACS Appl Mater Interfaces. 2017 May 17;9(19):16669-16678
