An ultrafast quantum thermometer from graphene quantum dots

Sehrawat, Poonam; Abid, Abid; Islam, S. S.

doi:10.1039/c8na00361k

Cited by 22 publications

(27 citation statements)

References 111 publications

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“…smart elements onto clothing to monitor aspects of human health and wellness, location, positioning, predominant posture, walking speed, and so forth. [1][2][3][4] As a crucial fundamental unit, emerging wearable sensing materials, such as strain sensors, temperature sensors, 6 humidity and moisture sensors, 7 have considerably attracted numerous attentions on how to fabricate flexible strain sensors with high sensitivity, wide sensing range and durability. To date, the integrating routes of sensors on clothing is typically determined by structures and materials of the sensors, directly adhered onto human skin 8 or encapsulated into fabrics, 9 which results in unsatisfied wear experience.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Disordered Porous Fibers for Self-Sensing and Self-Cooling Integrated Smart Sportswear

et al. 2019

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Smart clothing has demonstrated potential applications in a wide range of wearable fields for human body monitoring and self-adaption. However, current wearable sensors often suffer from not seamlessly integrating with normal clothing, restricting sensing ability, and a negative wearing experience. Here, integrated smart clothing is fabricated by employing multiscale disordered porous elastic fibers as sensing units, which show the capability of inherently autonomous self-sensing (i.e., strain and temperature sensing) and self-cooling. The multiscale disordered porous structure of the fibers contributes to the high transparency of mid-infrared human body radiation and backscatter of visible light, which allows the microenvironment temperature between the skin and clothing to drop at least ∼2.5 °C compared with cotton fabrics. After the capillary-assisted adsorption of graphene inks, the modified porous fibers could also possess real-time strain and temperature-sensing capacities with a high gauge factor and thermal coefficient of resistance. As a proof of concept, the integrated smart sportswear achieved the measuring of body temperature, the tracking of large-scale limb movements, and the collection of subtle human physiological signals, along with the intrinsic self-cooling ability.

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Section: Introductionmentioning

confidence: 99%

Multiscale Disordered Porous Fibers for Self-Sensing and Self-Cooling Integrated Smart Sportswear

et al. 2019

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“…In this approach, we have spin coated pre-synthesized graphene oxide (GO) solution over the Si/SiO 2 substrate prior to CVD growth. Hummers’ method [ 38 , 39 , 40 ] has emerged as a well-established technique to prepare graphite oxide which can then be ultrasonicated to yield graphene oxide (GO). Briefly, natural graphite powders (5.0 g), H 2 SO 4 (120 mL) and NaNO 3 (2.5 g) were mixed via continuous stirring.…”

Section: Resultsmentioning

confidence: 99%

“… ( a ) Schematic diagram showing the reduced dielectric screening on the e-h pair bonding in a typical 2D material [ 38 , 39 , 40 ]. ( b ) Neutral A-excitonic transition ( X A ) in the energy level diagram, and ( c ) PL spectra of WS 2 grown over Si/SiO 2 substrate.…”

Section: Figurementioning

confidence: 99%

“…In this work, we present a novel approach for large area synthesis of WS 2 on graphene oxide (GO) surface via CVD under high temperature conditions of 1070 °C. Upon transformation to RGO during growth process, GO becomes a mixed sp 3 - sp 2 bonded network, where nano-sized sp 2 -patches of size ~3–6 nm, are randomly distributed with more than 60–70% coverage [ 38 , 39 , 40 ]. The sp 2 -patches are six-fold aromatic carbon atoms with C=C bonds, whereas major percentage of sp 3 bonds constitutes epoxides (C–O) and hydroxyl (−OH) groups in the basal plane and somewhat lesser amount of carboxyl (−COOH) and carbonyl (−C=O) functionalities in the edges [ 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

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Interface Kinetics Assisted Barrier Removal in Large Area 2D-WS2 Growth to Facilitate Mass Scale Device Production

et al. 2021

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Growth of monolayer WS2 of domain size beyond few microns is a challenge even today; and it is still restricted to traditional exfoliation techniques, with no control over the dimension. Here, we present the synthesis of mono- to few layer WS2 film of centimeter2 size on graphene-oxide (GO) coated Si/SiO2 substrate using the chemical vapor deposition CVD technique. Although the individual size of WS2 crystallites is found smaller, the joining of grain boundaries due to sp2-bonded carbon nanostructures (~3–6 nm) in GO to reduced graphene-oxide (RGO) transformed film, facilitates the expansion of domain size in continuous fashion resulting in full coverage of the substrate. Another factor, equally important for expanding the domain boundary, is surface roughness of RGO film. This is confirmed by conducting WS2 growth on Si wafer marked with few scratches on polished surface. Interestingly, WS2 growth was observed in and around the rough surface irrespective of whether polished or unpolished. More the roughness is, better the yield in crystalline WS2 flakes. Raman mapping ascertains the uniform mono-to-few layer growth over the entire substrate, and it is reaffirmed by photoluminescence, AFM and HRTEM. This study may open up a new approach for growth of large area WS2 film for device application. We have also demonstrated the potential of the developed film for photodetector application, where the cycling response of the detector is highly repetitive with negligible drift.

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“…MoS 2 films grown by pulse laser deposition (PLD) on silicon exhibit a higher TCR (−2.9% K –1 at 296 K), a higher mid-IR sensitivity (Δ R / R = 5.2%), and a higher responsivity (8.7 V·W –1 ) than films grown by PLD on other substrates or mechanically exfoliated MoS 2 flakes transferred to various substrates. Sehrawat et al developed an ultra-sensitive temperature sensor made of graphene quantum dots (GQDs) embedded in a self-standing RGO sheet. GQDs are formed as a natural product during the synthesis of GO into RGO.…”

Section: Introductionmentioning

confidence: 99%

External Boosting of Free Carriers and Phonon Energy in MoS₂/Reduced Graphene Oxide Nanosheet-Based Composite Films: Implications for Thermal Management

Khan

Abid

Sehrawat

et al. 2023

ACS Appl. Nano Mater.

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We present here the fabrication of a MoS2/reduced graphene oxide nanosheet-based composite thin film with optimized stoichiometry to boost free carriers and phononic activity for heat transport, all these in a bid to develop an efficient solid-state thermometer. The possibility is envisaged from theoretical analysis followed by subsequent validation with experimental results on two fundamental material parameters, such as temperature coefficient of resistance (TCR) and thermal hysteresis loss (H th), which fundamentally govern the heat transport and control the thermal sensor characteristics, such as response magnitude, response- and recovery-time, sensitivity, and resolution. In the static mode, the measured sensing data in the high temperature range (298–373 K) are as follows: TCR of −0.71% K–1, response- and recovery time of ∼73 and ∼75 s, respectively, with ∼0.36% hysteresis loss. In the low-temperature range (298–123 K), the maximum TCR observed is ∼−7.23% K–1 with ∼0.40% hysteresis loss, whereas in the instant mode, TCR increases manifold in the low-temperature range (298–77 K) up to ∼34.19% K–1. Besides, the sensor exhibits a fast response of ∼2 s and recovery time of ∼19 s with negligible hysteresis loss of ∼1.49%; showing the material’s possible application as a superior solid-state thermometer in the low as well as high temperature ranges.

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An ultrafast quantum thermometer from graphene quantum dots

Abstract: We report an ultra-sensitive temperature sensor derived from graphene quantum dots (GQDs) embedded in a self-standing reduced graphene oxide (RGO) film.

Cited by 22 publications

References 111 publications

Multiscale Disordered Porous Fibers for Self-Sensing and Self-Cooling Integrated Smart Sportswear

Multiscale Disordered Porous Fibers for Self-Sensing and Self-Cooling Integrated Smart Sportswear

Interface Kinetics Assisted Barrier Removal in Large Area 2D-WS2 Growth to Facilitate Mass Scale Device Production

External Boosting of Free Carriers and Phonon Energy in MoS₂/Reduced Graphene Oxide Nanosheet-Based Composite Films: Implications for Thermal Management

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An ultrafast quantum thermometer from graphene quantum dots

Abstract: We report an ultra-sensitive temperature sensor derived from graphene quantum dots (GQDs) embedded in a self-standing reduced graphene oxide (RGO) film.

Cited by 22 publications

References 111 publications

Multiscale Disordered Porous Fibers for Self-Sensing and Self-Cooling Integrated Smart Sportswear

Multiscale Disordered Porous Fibers for Self-Sensing and Self-Cooling Integrated Smart Sportswear

Interface Kinetics Assisted Barrier Removal in Large Area 2D-WS2 Growth to Facilitate Mass Scale Device Production

External Boosting of Free Carriers and Phonon Energy in MoS2/Reduced Graphene Oxide Nanosheet-Based Composite Films: Implications for Thermal Management

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Product

Resources

About

External Boosting of Free Carriers and Phonon Energy in MoS₂/Reduced Graphene Oxide Nanosheet-Based Composite Films: Implications for Thermal Management