White and Tunable Emission from and Rhodamine B Detection by Modified Zinc Oxide Nanowalls

Abstract

To gain better optical and optoelectrical properties, doping trivalent lanthanide cations into host materials is a very attractive approach in nanoscience. Here, we use a transparent conducting oxide, zinc oxide, as the host material to directly embed trivalent terbium cations without the need for any postgrowth treatment, and we investigate the photophysical effect of the dopant. Trivalent Tb cations embedded in ZnO nanowalls produce hypersensitive green emission (at 545 nm, corresponding to the D → F transition) and convert the emission color of ZnO from yellow into white. Evidently, the photoluminescence emission intensity of Tb(III) is further increased by close to 10-fold due to the plasmonic effect introduced by noble metal (Ag and Pt) nanoparticles. The characteristic Tb(III) emission is found to be tunable from white to red and is examined for its potential chemosensing application for rhodamine B involving a plausible cascade energy transfer mechanism from ZnO to rhodamine B via Tb(III) cations.

Cobalt Phthalocyanine-Sensitized Graphene–ZnO Composite: An Efficient Near-Infrared-Active Photothermal Agent

“…However, ZnO can cause cytotoxic effects in cancer cells and destroy them . Hence, ZnO could be a promising candidate for the next-generation biomedical applications, and it has been broadly executed as a nanocarrier for various biomolecules. , However, UV emission connected with excitonic band edge and visible emission attributed with sundry intrinsic defects of ZnO has restricted its use merely to UV and visible radiations . Hence, to modify the response of ZnO toward NIR radiations, it is crucial to conjugate it with a secondary candidate such as GR.…”

“…15,16 However, UV emission connected with excitonic band edge and visible emission attributed with sundry intrinsic defects of ZnO has restricted its use merely to UV and visible radiations. 17 Hence, to modify the response of ZnO toward NIR radiations, it is crucial to conjugate it with a secondary candidate such as GR. Owing to the distinct properties of GR, its combination with ZnO can prolong the ability of ZnO to absorb NIR radiations.…”

ZnO/B-g-C3N4 Nanoplatelet/Nanosheet Heterostructures for the Electrochemical Detection of Metol in Real Sample Analysis

“…In addition, ZnO has an excellent isoelectric point (IPE) about ∼9.5 and to be conductive by decoration/doping into 2D-B-GCN. Furthermore, the appropriate modifications of ZnO structures such as nanoplatelet, nanowires, , nanoarrays, nanoparticles, flowers, and nanowalls , with an active surface area also provided us more choices for particular application . From now, ZnO has gained much attention as one of the utmost promising nanomaterials for the third generation of electrochemical sensors.…”