Results 191 to 200 of about 1,047,326 (236)

Ratiometric fluorescence detection of Cd2+ and Pb2+ by inner filter-based upconversion nanoparticle-dithizone nanosystem

Microchemical journal (Print), 2019
This paper reports a fluorescence sensor based on inner filter effect (IFE) between upconversion nanoparticles (UCNPs) and dithizone for the highly selective and sensitive detection of cadmium ion (Cd2+) and lead ion (Pb2+) in black tea. The fluorescence
Min Chen, F. Kutsanedzie, Cheng Wu, Huanhuan Li, Quansheng Chen   +4 more
semanticscholar   +1 more source

Upconversion luminescence from CdSe nanoparticles

The Journal of Chemical Physics, 2005
Efficient upconversion luminescence has been observed from CdSe nanoparticles ranging in size from 2.5 to 6 nm. The upconversion luminescence exhibits a near-quadratic laser power dependence. Emissions from both excitons and trap states are observed in the upconversion and photoluminescence spectra, and in the upconversion luminescence the emission ...
Wei, Chen, Alan G, Joly, David E, McCready   +2 more
openaire   +2 more sources

PET imaging with multimodal upconversion nanoparticles

Dalton Transactions, 2014
A series of new upconversion nanoparticles have been functionalised with tumour-targeting molecules and metal chelates, prepared following standard peptidic and thiol chemistry. The targeting strategy has been delivered via the αvβ3 integrin, which is a heterodimeric cell surface receptor that is up-regulated in a variety of cancers, such as melanoma ...
Juan, Gallo, Israt S, Alam, Jiefu, Jin, Yan-Juan, Gu, Eric O, Aboagye, Wing-Tak, Wong, Nicholas J, Long   +6 more
openaire   +2 more sources

Photon upconversion in core–shell nanoparticles

Chemical Society Reviews, 2015
This tutorial review highlights recent advances in the development of upconversion core–shell nanoparticles to cater for biological and energy applications.
Xian, Chen, Denfeng, Peng, Qiang, Ju, Feng, Wang   +3 more
openaire   +2 more sources

Upconversion Nanoparticles for Bioimaging

2016
Rare earth lanthanide-doped upconversion nanoparticles (UCNPs), which can nonlinearly convert long wavelength near-infrared (NIR) light illumination into multiplex emissions, have been widely used in biomedical applications for in vitro and in vivo biolabeling and optical data storage based on their controllable multicolor emission properties. Compared
Xiangzhao Ai, Junxin Aw, Bengang Xing
openaire   +1 more source

Molecular Upconversion Nanoparticles for Live-Cell Imaging [PDF]

ACS Nano
Precise molecular control has become a highly attractive feature to develop the next generation of upconversion materials for autofluorescence-free deep tissue imaging. However, in aqueous environments, upconversion molecules are orders of magnitude dimmer than inorganic upconversion nanoparticles, thereby strongly limiting their applicability to ...
Lucie Haye, Federico Pini, Lohona Kevin Soro, Richard C. Knighton, Nour Fayad, Magalie Benard, Francesco Gagliazzo, Mark E Light, Marta Maria Natile, Loïc J. Charbonnière, Niko Hildebrandt, Andreas Reisch   +11 more
openaire   +2 more sources

Infrared‐Sensitive Memory Based on Direct‐Grown MoS2–Upconversion‐Nanoparticle Heterostructure

Advances in Materials, 2018
Photonic memories as an emerging optoelectronic technology have attracted tremendous attention in the past few years due to their great potential to overcome the von Neumann bottleneck and to improve the performance of serial computers.
Yongbiao Zhai, Xueqing Yang, Feng Wang, Zongxiao Li, Guanglong Ding, Zhifan Qiu, Yan Wang, Ye Zhou, Su‐Ting Han   +8 more
semanticscholar   +1 more source

Synthesis of Yolk–Shell Polymeric Nanocapsules Encapsulated with Monodispersed Upconversion Nanoparticle for Dual-Responsive Controlled Drug Release

Macromolecules, 2018
Dual-responsive (light and pH) yolk–shell structured drug delivery nanocapsules, each consisting of a movable upconversion nanoparticle (UCNP) core and a shrinkable poly(methacrylic acid) (PMAA) shell, were prepared by distillation precipitation ...
Xiaotao Wang, Xiaoping Liu, Li Wang, C. Tang, W. Law, Gaowen Zhang, Yonggui Liao, Chuang Liu, Zuifang Liu   +8 more
semanticscholar   +1 more source

Spectroscopic properties and upconversion in Pr3+:YF3 nanoparticles

Physical Chemistry Chemical Physics, 2011
The synthesis and spectroscopic investigation of Pr(3+):YF(3) nanoparticles with nominal concentration between 0.05% and 5 at% Pr(3+) are reported. Pr(3+) emission in the visible range of the spectrum is investigated at room temperature and at 10 K as well as time resolved spectroscopy as a function of Pr(3+) concentration.
F Pellé, MDhaouadi, L Michely, P Aschehoug, A Toncelli, S Veronesi, M Tonelli   +6 more
openaire   +3 more sources

Upconversion Nanoparticles for Biosensing

2014
The last few decades have witnessed the emergence and rapid development of nanoscience and nanotechnology including nanochemistry, nanophysics, nanomedicine, and nanobiomaterials, which allows for the continuous exploration of facile, inexpensive, sensitive, and specific biological analytical techniques by employing nanobioprobes.
openaire   +1 more source