Universität zu Köln

Ding, Li, Leduc, Jennifer, Fischer, Thomas, Mathur, Sanjay and Li, Yan (2020). Gelation of uranyl ions and gel-derived uranium oxide nanoparticles for gas sensing. Nanoscale Adv., 2 (6). S. 2478 - 2485. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2516-0230

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Abstract

We developed a sol-gel method to synthesize uranium oxide nanoparticles with a clean surface and mixed valences of uranium at the surface. Uranyl gel was formed in ethylene glycol without incorporating any organic gelator and was readily converted to uranium dioxide nanoparticles with uniform sizeviamicrowave treatment. The as-prepared uranyl gel showed a high storage modulus of 0.48 kPa. The formation of the gel skeleton benefits from interlinkage of uranyl ions, which was revealed by UV-Vis spectroscopy and X-ray absorption. The U=O-ax bond was elongated by 0.1 angstrom and the U-O-eq bond was shortened by 0.25 angstrom by the gelation. The gel showed thixotropic and self-healing properties owing to the soft connection in the gel skeleton and photo-response attributed to the photo-reduction reaction between uranyl ions and matrix solvent. With the great inclusion properties, the uranyl gel was decomposed by microwave treatment into uranium dioxide nanoparticles with a size of similar to 4 nm. The resultant UO2 nanoparticles were easily oxidized in air, and thus presented an n-type semiconductor behaviour and sensitivity to both oxidative and reductive gases such as NO2, EtOH, CO, and NH3.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ding, Li UNSPECIFIED UNSPECIFIED UNSPECIFIED Leduc, Jennifer UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, Yan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-331504
DOI:	10.1039/d0na00224k
Journal or Publication Title:	Nanoscale Adv.
Volume:	2
Number:	6
Page Range:	S. 2478 - 2485
Date:	2020
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2516-0230
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language IN-SITU; CATALYSTS; COORDINATION; NANOCRYSTALS; TEMPERATURES; PERFORMANCE; HYDROLYSIS; ALCOHOLS; ELEMENTS; UV Multiple languages Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33150