Abstract Optical thermometry is a growing technological field which exploits the ability of certain materials to change their optical properties with temperature. In this work, poly(glycerol dendrimer) microspheres (PGLyD) encapsulating cobalt-doped hopeite (CoHo) was synthesized for its potential use as optical thermometer. The structure of the CoHo:PGLyD was studied using scanning electron microscopy (SEM), infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). On the basis of SEM images, the CoHo:PGLyD exhibited a spherical shape in which around 80% of the microspheres were within 0.82 µm. A multilayer feed-forward artificial neural network (MLP-ANN) was used to extract the chromaticity profile dependence of the CoHo:PGLyD with temperature. A color change was observed for the CoHo:PGLyD, going from dark blue (490-550 nm) to pale pink (650 nm) when the temperature changed from 20-200 °C, respectively. These results suggest that CoHo:PGLyD is a promising material for temperature sensing applications.
#1Szymon Goderski(Adam Mickiewicz University in Poznań)H-Index: 8
#2Marcin Runowski(Adam Mickiewicz University in Poznań)H-Index: 22
Last. Stefan Lis(Adam Mickiewicz University in Poznań)H-Index: 32
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The growing interest in the miniaturization of various devices and conducting experiments under extreme conditions of pressure and temperature causes the need for the development of small, contactl...
#1Yongliang Chen(UTS: University of Technology, Sydney)H-Index: 6
#2Thinh N. Tran(UTS: University of Technology, Sydney)H-Index: 2
Last. Toan Trong Tran(UTS: University of Technology, Sydney)H-Index: 22
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Nanoscale optical thermometry is a promising noncontact route for measuring local temperature with both high sensitivity and spatial resolution. In this work, we present a deterministic optical the...
Abstract Temperature monitoring plays an important role in ensuring product quality, saving energy, promoting the development of national economy and providing basic diagnostic criteria in the field of biomedicine. Due to the importance and universality of temperature measurement, the study of temperature sensing property and the pursuit of high sensitivity have become an important research field of rare-earth luminescent materials in recent years, and have received extensive attention. In this ...
#1Alex I. Finnegan(UIUC: University of Illinois at Urbana–Champaign)H-Index: 4
#2Jun S. Song(UIUC: University of Illinois at Urbana–Champaign)H-Index: 39
New architectures of multilayer artificial neural networks and new methods for training them are rapidly revolutionizing the application of machine learning in diverse fields, including business, social science, physical sciences, and biology. Interpreting deep neural networks, however, currently remains elusive, and a critical challenge lies in understanding which meaningful features a network is actually learning. We present a general method for interpreting deep neural networks and extracting...
Carbazole-substituted dicyanobenzenes and anthraquinone based intramolecular charge-transfer dyes, two classes of organic thermally activated delayed fluorescence (TADF) emitters developed for organic light-emitting diode (OLED) technology, are prepared and investigated for their suitability for optical oxygen and temperature sensing. The new materials do not offer any improvement compared to the state-of-the-art probes in respect to oxygen sensing. In contrast, due to very high temperature depe...
Measuring temperatures at small scales, especially around nanoparticles, is a crucial step for a variety of applications in biomedicine and in optics. Here, we report on a novel method to map tempe...
#2Igor E. Uflyand(SFedU: Southern Federal University)H-Index: 15
The synthetic methodologies, physico-chemical peculiarities, properties, and structure of metal chelate dendrimers and star and hyperbranched polymers are considered. These compounds are subdivided into molecular, intracomplex, and macrocyclic types which in turn are classified depending on the nature of the donor atoms (N,N-, N,O-, N,S-, O,O-, O,S-, S,S-, P,P-chelates, etc.). Special attention is paid to the features of the preparation of metal chelate star polymers by “arm-first”, “core-first”...
Abstract We carried out a laser spectroscopic investigation of high-pressure, high-temperature (HTHP) synthetic diamond containing NE8 defects. In the photoluminescence (PL) emission spectra the defects have a zero-phonon line (ZPL) at 794 nm. Under 730 nm excitation the width and position of the ZPL as well as the Debye-Waller factor showed systematic temperature dependences which were modelled in accordance of a modified model of impurity defects in solids. A strong dependence of the position ...
Semiconductor nanocrystals have been extensively studied for optoelectronic applications including light emission, the focus of this review. Historically, the core of the nanocrystal was the main aspect of the system as it gives rise to the confined excitons and multiexcitons which absorb and emit light. In addition to the core, the surface or interface of these nanocrystals is also important by virtue of their small size. Yet, our understanding of the surface is in its early stages in terms of ...
#1Guillaume Salek(CNRS: Centre national de la recherche scientifique)H-Index: 2
#2Alain Demourgues(CNRS: Centre national de la recherche scientifique)H-Index: 23
Last. Manuel Gaudon(CNRS: Centre national de la recherche scientifique)H-Index: 21
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Mn2+ doped Zn3(PO4)2 phosphate exhibits a rich thermal history with numerous events. Following the dehydration of Zn3(PO4)2⋅4H2O hopeite at temperatures up to T = 400 °C, various allotropic forms α/δ → γ → β can be stabilized with irreversible transitions for a 600 °C ⩽ T ⩽ 1000 °C temperature range. Furthermore, in these different networks, a transition metal can occupy distorted tetrahedral (α/δ forms) and pentahedral sites as well as octahedral sites for the high-temperature γ and β forms tha...