Thermal conductivity measurements of thin films by non-contact scanning thermal microscopy under ambient conditions

Zhang, Yun; Zhu, Weiye; Borca‐Tasciuc, Theodorian

doi:10.1039/d0na00657b

Cited by 23 publications

(18 citation statements)

References 52 publications

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“…We used 3DFEM model fitting 49 to determine the effective thermal conductivity κ film of the Ca 3 Co 4 O 9 films (see Fig. 9 ) by using a mica substrate thermal conductivity value of κ sub = 0.421 W m −1 K −1 , determined by SThM probe measurements.…”

Section: Resultsmentioning

confidence: 99%

“…Thermal conductivity of the annealed Ca 3 Co 4 O 9 lm-onmica samples was determined by non-contact scanning thermal microscopy (SThM) described elsewhere [49][50][51][52] . This technique utilizes a Joule-heated 5 mm-diameter Wollaston wire probe, whose thermal resistance was measured in air at 100 nm above the sample surface based on temperature-induced changes in the electrical resistance of the probe and the dissipated Joule heating power.…”

Section: Methodsmentioning

confidence: 99%

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Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

et al. 2022

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“…According to Equation (), low junction temperature of the SµLEDs was attributed to low internal resistance by vertical current path of 3 µm thin µLEDs and excellent heat dissipation by highly‐conductive Au electrodes. [ 39,60–62 ]…”

Section: Resultsmentioning

confidence: 99%

Wearable Surface‐Lighting Micro‐Light‐Emitting Diode Patch for Melanogenesis Inhibition

Lee

Ahn

Lee

et al. 2022

Adv Healthcare Materials

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Wearable light‐emitting diode (LED)‐based phototherapeutic devices have recently attracted attention as skin care tools for wrinkles, acne, and hyperpigmentation. However, the therapeutic effectiveness and safety of LED stimulators are still controversial due to their inefficient light transfer, high heat generation, and non‐uniform spot irradiation. Here, a wearable surface‐lighting micro‐LED (SµLED) photostimulator is reported for skin care and cosmetic applications. The SµLEDs, consisting of a light diffusion layer (LDL), 900 thin film µLEDs, and polydimethylsiloxane (PDMS), achieve uniform surface‐lighting in 2 × 2 cm2‐sized area with 100% emission yields. The SµLEDs maximize photostimulation effectiveness on the skin surface by uniform irradiation, high flexibility, and thermal stability. The SµLED's effect on melanogenesis inhibition is evaluated via in vitro and in vivo experiments to human skin equivalents (HSEs) and mouse dorsal skin, respectively. The anti‐melanogenic effect of SµLEDs is confirmed by significantly reduced levels of melanin contents, melan‐A, tyrosinase, and microphthalmia‐associated transcription factor (MITF), compared to a conventional LED (CLED) stimulator.

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“…On the basis of the above consideration, we were interested in SThM imaging of binary SAMs under nonphysical contact conditions (Figures S4–S6 and the Supporting Information). Although noncontact measurements are not general in SThM, several examples have previously been reported for metals. ,− For comparison, we carried out noncontact SThM measurements for the same observation areas as in contact SThM imaging. Figure shows 2D maps of Δ T at the noncontact regimes.…”

Section: Resultsmentioning

confidence: 99%

Visualization of Thermal Transport Properties of Self-Assembled Monolayers on Au(111) by Contact and Noncontact Scanning Thermal Microscopy

et al. 2021

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Thermal transport properties of patterned binary self-assembled monolayers (SAMs) on Au(111) were examined using scanning thermal microscopy (SThM) with both contact and noncontact methods. We fabricated two-dimensional (2D) patterns with two separate domains of n-hexadecanethiol/benzenethiol, benzenethiol/n-butanethiol, or n-hexadecanethiol/n-butanethiol. In the experimental setup, the efficiency of thermal transport from a SThM tip to the SAM surface can be evaluated in terms of the temperature change at the SThM tip. In the contact regime, where a SThM tip physically contacts the SAM surface, direct thermal transport through the SAM and radiation-based thermal transport through the space where SAMs exist may contribute to a drop in temperature at the tip. In the noncontact regime, thermal transport relies on radiation-based heat dissipation from the heated tip to the SAMs. 2D mapping of the spatial temperature distribution on SAMs reflects the difference in thermal transport properties of the two SAM domains. We found that the contact method is effective for visualizing the temperature contrast, which reflects the thermal transport properties of the constituent molecules when the domains of the SAMs have a similar height, while the noncontact method allows visualization of the temperature distribution, which is related to the height of each domain of the SAMs, rather than the chemical structures of the constituent molecules. Combination of contact and noncontact SThM enables 2D imaging of thermal transport properties and topographic imaging simultaneously and represents a new technique for investigating the thermal properties of materials surfaces, which is essential for nanoscale thermal management.

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Thermal conductivity measurements of thin films by non-contact scanning thermal microscopy under ambient conditions

Abstract: Accurate thermal conductivity measurements of nanoscale thin-films on substrate samples by non-contact SThM with finite element heat transfer modeling in transition regime and with fitting functions and analytical heat transfer modeling for fast analysis.

Cited by 23 publications

References 52 publications

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

Wearable Surface‐Lighting Micro‐Light‐Emitting Diode Patch for Melanogenesis Inhibition

Visualization of Thermal Transport Properties of Self-Assembled Monolayers on Au(111) by Contact and Noncontact Scanning Thermal Microscopy

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Thermal conductivity measurements of thin films by non-contact scanning thermal microscopy under ambient conditions

Abstract: Accurate thermal conductivity measurements of nanoscale thin-films on substrate samples by non-contact SThM with finite element heat transfer modeling in transition regime and with fitting functions and analytical heat transfer modeling for fast analysis.

Cited by 23 publications

References 52 publications

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)2/Co3O4 multilayers

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)2/Co3O4 multilayers

Wearable Surface‐Lighting Micro‐Light‐Emitting Diode Patch for Melanogenesis Inhibition

Visualization of Thermal Transport Properties of Self-Assembled Monolayers on Au(111) by Contact and Noncontact Scanning Thermal Microscopy

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Product

Resources

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Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers

Engineering thermoelectric and mechanical properties by nanoporosity in calcium cobaltate films from reactions of Ca(OH)₂/Co₃O₄ multilayers