On the optical measurement of microparticle charge using quantum dots

Pustylnik, Mikhail; Marvi, Zahra; Beckers, JL Jozef

doi:10.1088/1361-6463/ac3862

Cited by 4 publications

(20 citation statements)

References 52 publications

(103 reference statements)

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“…On this basis, the so-called "fast" red shift in [25] was attributed to the Stark effect. In accord with that, in [27], periodic pulsing of the plasma (on the timescales between those of charging and heating) was suggested to distinguish between the thermal and electrostatic effects on the QD photoluminescence spectrum. The weak point of this approach is that this is, in fact, not the surface temperature, but rather the temperature of the QDs which determines the thermal spectral shift.…”

Section: Introductionsupporting

confidence: 65%

“…We suppose that the QD and the microparticle surface can freely exchange charge. In addition to that, it was shown in [27] that the typical average distances between the electrons on the microparticle surface is much larger than the QD size. The QD, although it collects the charged particles, will, consequently, most of the time stay uncharged.…”

Section: Chargingmentioning

confidence: 94%

“…We are however mostly interested not in the steadystate temperatures, but in the oscillations of T QD in response to pulsing the plasma. As already mentioned above, pulsing of the plasma was suggested in [27], as a possible measure to distinguish between the thermal and charge-induced Stark shift of the photoluminescence spectrum of the plasma-facing QDs. Thermal contact of the QD and the microparticle (represented by the unknown effective flux J QDMP in Equation ( 8)) should provide the QD sufficient thermal inertia making the optical charge measurements possible.…”

Section: Periodically Pulsed Plasmamentioning

confidence: 99%

“…In [27], the detection limit of the red shift of the QD photoluminescence was determined based on the data of [25] as 0.02 nm. According to [28][29][30], the thermal red shift of the CdSe QD photoluminescence is ∼ 0.1 nm K −1 .…”

Section: Experimental Detectabilitymentioning

confidence: 99%

“…Also, very recently, it was shown that semiconductor nanocrystals, quantum dots (QDs) [22][23][24], deposited on a large flat surface are sensitive to the charge on this surface [25] due to the quantum-confined Stark effect [26]: Spectrum of their photoluminescence experiences red shift in reaction to the local electric field. In [27], it was proposed to design a charge microsensor by attaching the QDs to the surface of a micrometersized spherical particle. The calculations showed that under typical conditions of dusty plasma experiments, such a microsensor can exhibit Stark shifts of the order of fractions of a nanometer.…”

Section: Introductionmentioning

confidence: 99%

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Quantum dot on a plasma-facing microparticle surface: Thermal balance

Pustylnik¹

2022

Preprint

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Semiconductor nanocrystals, quantum dots, are known to exhibit the quantum-confined Stark effect which reveals itself in the shift of their photoluminescence spectra in response to external electric field. It was, therefore, proposed to use quantum dots deposited on the microparticle surface for the optical measurement of the charge acquired by the microparticles in lowtemperature plasmas. Thermal balance of a quantum dot residing on the surface of a microparticle immersed in a plasma is considered in this work. It is shown for typical plasma parameters that under periodically pulsed plasma conditions, the spectral shift of the photoluminescence of the quantum dot caused by the oscillations of its temperature becomes undetectable at the effective thermal flux characterizing the thermal contact between the quantum dot and the microparticle ∼ 10 9 s −1 . Under these conditions, the entire spectral shift observed during the period of plasma pulsing should be attributed to the quantum-confined Stark effect due to the microparticle charge. Lower-boundary estimate for the effective thermal flux for the direct contact between the quantum dot and the microparticle is ∼ 10 12 s −1 .

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Section: Introductionsupporting

confidence: 65%

Section: Chargingmentioning

confidence: 94%

Section: Periodically Pulsed Plasmamentioning

confidence: 99%

Section: Experimental Detectabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantum dot on a plasma-facing microparticle surface: Thermal balance

Pustylnik¹

2022

Preprint

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Quantum dot on a plasma‐facing microparticle surface: Requirement on thermal contact for optical charge measurement

Pustylnik

2022

Contributions to Plasma Physics

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Semiconductor nanocrystals, quantum dots (QDs), are known to exhibit the quantum-confined Stark effect which reveals itself in the shift of their photoluminescence spectra in response to the external electric field. It was, therefore, proposed to use QDs deposited on the microparticle surface for the optical measurement of the charge acquired by the microparticles in low-temperature plasmas. Another physical process leading to the shift of the photoluminescence spectra of the QDs is heating. Charging of plasma-facing surfaces is always accompanied by their heating. Thermal balance of a quantum dot residing on the surface of a microparticle immersed in a plasma is considered in this work.It is shown that under periodically pulsed plasma conditions, the spectral shift of the photoluminescence of the quantum dot caused by the oscillations of its temperature becomes undetectable if the effective thermal flux characterizing the thermal contact between the quantum dot and the microparticle exceeds the value ranging from 10 8 to 10 10 s −1 depending on the plasma parameters. If this effective thermal flux exceeds the above-mentioned values, the entire spectral shift observed during the period of plasma pulsing should be attributed to the quantum-confined Stark effect due to the microparticle charge. Lower-boundary estimate for the effective thermal flux for the direct contact between the quantum dot and the microparticle is ∼ 10 12 s −1 . Estimations based on the heat conductivity of ligand-stabilized nanocrystal arrays yield even higher values of the effective thermal flux ∼ 10 13 s −1 .

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Physics and applications of dusty plasmas: The Perspectives 2023

Beckers,

Berndt,

Block

et al. 2023

Physics of Plasmas

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Dusty plasmas are electrically quasi-neutral media that, along with electrons, ions, neutral gas, radiation, and electric and/or magnetic fields, also contain solid or liquid particles with sizes ranging from a few nanometers to a few micrometers. These media can be found in many natural environments as well as in various laboratory setups and industrial applications. As a separate branch of plasma physics, the field of dusty plasma physics was born in the beginning of 1990s at the intersection of the interests of the communities investigating astrophysical and technological plasmas. An additional boost to the development of the field was given by the discovery of plasma crystals leading to a series of microgravity experiments of which the purpose was to investigate generic phenomena in condensed matter physics using strongly coupled complex (dusty) plasmas as model systems. Finally, the field has gained an increasing amount of attention due to its inevitable connection to the development of novel applications ranging from the synthesis of functional nanoparticles to nuclear fusion and from particle sensing and diagnostics to nano-contamination control. The purpose of the present perspectives paper is to identify promising new developments and research directions for the field. As such, dusty plasmas are considered in their entire variety: from classical low-pressure noble-gas dusty discharges to atmospheric pressure plasmas with aerosols and from rarefied astrophysical plasmas to dense plasmas in nuclear fusion devices. Both fundamental and application aspects are covered.

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On the optical measurement of microparticle charge using quantum dots

Cited by 4 publications

References 52 publications

Quantum dot on a plasma-facing microparticle surface: Thermal balance

Quantum dot on a plasma-facing microparticle surface: Thermal balance

Quantum dot on a plasma‐facing microparticle surface: Requirement on thermal contact for optical charge measurement

Physics and applications of dusty plasmas: The Perspectives 2023

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