Remote Thermal Sensing by Integration of Corner‐Cube Optics and Thermochromic Materials

Khalid, Muhammad Waqas; Whitehouse, C.S.; Ahmed, Rajib; Hassan, Muhammad Umair; Butt, Haider

doi:10.1002/adom.201801013

Cited by 19 publications

(8 citation statements)

References 22 publications

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“…Other non-contact temperature measurement methods use the fluid in the partitions as a sensing element, via the inclusion of thermochromic dyes, such as organic leuco dyes, with specific temperature-dependent optical properties. 25 However, these methods are restricted to temperatures up to ≈50 °C, insufficient for dPCR applications. An obvious alternative would seem to be fluorescein, as its amplitude of fluorescence ( F ) is a function of T , 26 and fluorescence measurements are compatible with the instrumentation used for dPCR quantification.…”

Section: Introductionmentioning

confidence: 99%

Temperature non-uniformity detection on dPCR chips and temperature sensor calibration

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Temperature non-uniformity detection on dPCR chips and temperature sensor calibration

et al. 2022

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“…Stimuli responsive materials [1] constitute functional building blocks of next generation devices: a wide variety of new technolo gies, ranging from sensors [2][3][4][5][6] to molecular electronics [7][8][9][10][11] and multilevel security devices, [12] rely on changes in optical properties upon application of stimuli. Light, [7][8][9][10][11] heat, [10,[13][14][15] solvent (and its vapor), [16][17][18] and mechanical forces, [2,6,[19][20][21][22] modify the struc ture of materials at the (supra)molecular level to effect changes in both absorption and emission properties. Among these stimuli responsive processes, mechanofluorochromism, the change Recently, mechanofluorochromic films based on a family of diphenylamine compounds functionalized with πextended thiophene and dicyanovinyl groups and Nsubstituted with oligooxyethylene groups were developed.…”

Section: Introductionmentioning

confidence: 99%

Mechanofluorochromic Material toward a Recoverable Microscale Force Sensor

Calupitan

Brosseau

Josse

et al. 2022

Adv Materials Inter

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cation of mechanical stimuli such as scratching or grinding, promises applications for force sensors. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] Emission changes of coordination complex crystals, [24] polymeric microcrystals, [30] and organic fluorophores, [31][32][33][34][35][36] have been correlated to an applied force or pressure for new anticounterfeiting technologies [23][24][25][26][27][28] and biological stress probes. [29] Force sensing via mechanofluorochromic activity has been reported at the micro/nanoscales by direct measurement of emission changes upon in situ application of varying amounts of mechanical stimulus. [24,30,31,[33][34][35][36] Yet, one issue that remains to be explored is the recovery of the material. Emission changes, correlated with applied force, are induced by morphological changes in the material. This means that subsequent sensing events, after the initial application of force, necessitate recovering the original morphology-a process not so straightforward as this usually requires thermal annealing, [38] solvent fuming, [25,27] or recrystallization. [20][21][22]37] Self-recovery, the spontaneous return to the initial state (of absorption, emission and morphology) of the scratched/ground material under ambient conditions, has been observed in derivatives based on Au(I) complexes, [28] pyrene, [39,40] anthracene, [41,42] tetraphenylethene, [43,44] indolylbenzothiadiazole, [45] triphenylamine, [46] boron-coordinated β-diketonate complexes, [47] and hexathiobenzene. [48] However, many MFC-active materials are left unexplored for multiple-use force sensing applications, not only due to the complexity of instrumentation required for such studies, [24,30,31,[33][34][35][36] but also due to the lack of molecular design leading to reversibility [40] and a clear understanding of mechanism of self-recovery. [30,45] Recently, mechanofluorochromic films based on a family of diphenylamine compounds functionalized with π-extended

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“…Luminescent thermometry − is a unique technique of temperature measurement, which offers the noncontact and electrically passive temperature readout, taking advantage of the thermally dependent spectroscopic properties of phosphors. A ratiometric luminescent thermometer, based on the relative intensity of two emission regimes, is one of the most commonly studied types because of the high reliability and accuracy of the output which it offers. ,,− Significant relative sensitivity ( S r ) of a ratiometric luminescent thermometer is provided when the intensities of two emission bands of an optically active center reveal opposite thermal monotonicities.…”

Section: Introductionmentioning

confidence: 99%

Excited State Absorption for Ratiometric Thermal Imaging

Drabik

Marciniak

2020

ACS Appl. Mater. Interfaces

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Luminescence thermometry, an alternative to thermal imaging using the thermovision technique, requires the development of new approaches and a thorough understanding of the physical phenomena involved, in order to improve the temperature readout parameters. A phenomenon that has recently been shown to cause an extremely strong increase in the emission intensity for the temperature elevation is the thermally induced excited state absorption. This work demonstrates that taking advantage of the strong thermal dependence of the thermally induced excited state absorption process, the limitation associated with the two thermally coupled excited levels usually involved in the ratiometric temperature readout can be overcome, improving the thermometric properties of the luminescent thermometer. The same excitation wavelength was used to induce the emission resulting from the thermally induced excited state absorption of the Tb3+ ions and ground-state absorption of the other type of co-dopant ions causing the opposite nature of the thermal dependence of their emission intensities. Moreover, thanks to the strong color changes exhibited by the phosphors, it was possible to demonstrate the applicability of the proposed approach for through-object 2D thermal imaging of a microelectronic printed circuit board covered with a glass plate using an ordinary commercial digital camera, where the thermovision camera fails.

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Remote Thermal Sensing by Integration of Corner‐Cube Optics and Thermochromic Materials

Cited by 19 publications

References 22 publications

Temperature non-uniformity detection on dPCR chips and temperature sensor calibration

Temperature non-uniformity detection on dPCR chips and temperature sensor calibration

Mechanofluorochromic Material toward a Recoverable Microscale Force Sensor

Excited State Absorption for Ratiometric Thermal Imaging

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