Xiangui Ma, Wenyue Gao, Fangxin Du, Fan Yuan, Jing Yu, Neso Sojic, Guobao Xu
Acc. Chem. Res., 2021, DOI: 10.1021/acs.accounts.1c00230
Fabio Rizzo, Federico Polo, Neso Sojic, Guobao Xu
H.-N. Barad, M. Alarcón-Correa, G. Salinas, E. Oren, F. Peter, A. Kuhn, P. Fischer
Materials Today, 2021, 50, 89-99
The rapid generation of material libraries with multidimensional gradients is important for the discovery of new functional materials. Here we report an integrated fabrication scheme, based on glancing angle physical vapor deposition, to form a thin-film materials library with controlled variations in nanoshape, multinary composition, and oxidation state on a single large area substrate. We demonstrate the versatility of the method by growing an octonary materials system, which we characterize with high-throughput methods, and reveal variations in several physico-chemical properties. Among others, we examine the materials library in the frame of the oxygen evolution reaction and show that nanostructuring leads to NiO clusters that are active towards such a reaction. Our scheme can be readily extended to include more starting elements, and can be transferred to other deposition methods, making this an adaptable and versatile platform for combinatorial materials science.
I. Pavel, G. Salinas, M. Mierzwa, S. Arnaboldi, P. Garrigue, A. Kuhn
ChemPhysChem, 2021, 22, 1321-1325
Numerous artificial micro- and nanomotors, as well as various swimmers have been inspired by living organisms that are able to move in a coordinated manner. Their cooperation has also gained a lot of attention because the resulting clusters are able to adapt to changes in their environment and to perform complex tasks. However, mimicking such a collective behavior remains a challenge. In the present work, magnesium microparticles are used as chemotactic swimmers with pronounced collective features, allowing the gradual formation of macroscopic agglomerates. The formed clusters act like a single swimmer able to follow pH gradients. This dynamic behavior can be used to spot in a straightforward way localized corrosion events. The autonomous docking of the swimmers to the corrosion site leads to the formation of a local protection layer, thus increasing corrosion resistance and triggering partial self-healing.
J. Yu, H. Saada, N. Sojic, G. Loget
Electrochim. Acta, 2021, 381, 138238
In this article, we study the photoinduced electrochemiluminescence (PECL) of a luminol analog (L-012: 8-amino- 5–chloro-2,3-dihydro-7-phenyl-pyrido[3,4- d ]pyridazine-1,4–dione) on n-type hematite (α-Fe2O3) nanorod arrays deposited by hydrothermal synthesis on a transparent conducting oxide. We report that this material, when used as a photoanode, triggers PECL at a potential as low as -0.2 V vs Ag/AgCl and allows the amplification of the luminescence signal. The PECL concept should open up new perspectives based on light-addressable strategies in bioanalysis and imaging.
Read more: Photoinduced electrochemiluminescence at nanostructured hematite electrodes