Zipper model for the melting of thin films

Abdullah, Mikrajuddin; Khairunnisa, Shafira; Akbar, Fiki T.

doi:10.1088/0143-0807/37/1/015501

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…During the graphene synthesis using PECVD, the patterns are well maintained even when the temperature rises up to 900 °C, as shown in figures 2(b) and (c). We carefully selected the optimum thickness of the Cu film for the synthesis of graphene in order to prevent structural deformation of patterns, because the melting point of Cu film becomes lower than that of bulk Cu [35,36]. The surface roughness of deposited Cu film increases after the synthesis of graphene using PECVD when compared to that of the asdeposited Cu film.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of vertical van der Waals gap array using single-and multi-layer graphene

Kim¹,

Bahk²,

Kim³

et al. 2019

Nanotechnology

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Arrays of van der Waals gaps were manufactured by synthesizing the vertically aligned graphene layer stacked between two copper (Cu) catalytic films. The Cu-graphene-Cu laminated structure was obtained by directly synthesizing graphene on a patterned Cu film followed by depositing a second copper layer for optical measurements. The synthesis of graphene on the Cu surface was optimized by adjusting the synthesis temperatures and pre-annealing time using plasma enhanced chemical vapor deposition (PECVD). Resonant Raman spectroscopy measurements reveal that graphene can be synthesized on both bulk Cu foil and relatively thin Cu film under the same growth mechanism using PECVD. Structural and optical characterizations of the array of graphene van der Waals gaps were implemented by the transmission electron microscope and terahertz-time domain spectroscopy (THz-TDS). In THz-TDS, the measured THz amplitude transmitted through the graphene van der Waals gap slit array was constant regardless of the gap width determined by the number of graphene layers between the Cu thin films in a single slit. These results imply that the optical dielectric constant of graphene at THz frequencies in the outof-plane direction is linearly proportional to the gap width. Our results of the manufacturing method can be adopted to investigate mechanical, electrical, and optical properties of other 2D materials such as h-BN, MoS 2 , and others. Furthermore, metal-graphene-metal structures with vertical orientations can be used in many electronic, optic, and optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

Fabrication of vertical van der Waals gap array using single-and multi-layer graphene

Kim¹,

Bahk²,

Kim³

et al. 2019

Nanotechnology

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“…Previous ADI-MS work with the microplasma showed that temperatures as high as 300 °C can be realized on glass substrates. 20 This level of thermal energy may well be sufficient to vaporize solution residue samples and thin (≤100 nm) metallic films 28,29 but is not high enough to vaporize bulk metals. Because the LS-APGD is sustained with a flow of 5% HNO 3 , acid dissolution could be important.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Conceptual Demonstration of Ambient Desorption-Optical Emission Spectroscopy Using a Liquid Sampling-Atmospheric Pressure Glow Discharge Microplasma Source

2016

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The concept of ambient desorption-optical emission spectroscopy (AD-OES) is demonstrated using a liquid sampling-atmospheric pressure glow discharge (LS-APGD) microplasma as the desorption/excitation source. The LS-APGD has previously been employed for elemental analysis of solution samples and particulates introduced via laser ablation in both the optical emission and mass spectrometries (OES, MS) modes. In addition, the device has been shown to be effective for the analysis of elemental and molecular species operating in an ambient desorption/ionization mass spectrometry (ADI-MS) mode. Proof-of-concept is presented here in the use of the LS-APGD to volatilize three very diverse sample forms (metallic thin films, dry solution residues, and bulk materials), with the liberated material excited within the microplasma and detected via OES, i.e., AD-OES. While the demonstration is principally qualitative at this point, it is believed that the basic approach may find application across a broad spectrum of analytical challenges requiring elemental analysis, including metals, soils, and volume-limited solutions, analogous to what has been seen in the development of the field of ADI-MS for molecular species determinations.

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“…The final mass (177 ± 1 ng) corresponds to a mass loss of 33.6%. This mass loss indicates that CuSO 4 •5H 2 O dehydrates completely and also reduced finally to Cu 2 O following these reaction steps [48].…”

Section: Tg With Cuso 4 •5h 2 O Crystalsmentioning

confidence: 94%

“…We associate the current value at which the microheater fails to the melting temperature of platinum (1768 °C). The melting point of thin films for a thickness >50 nm is equivalent to the bulk values [47,48]. We took the melting temperature and the corresponding power that led to failure of the heater as one calibration point (burn-through), and room temperature as second calibration point.…”

Section: Microheatermentioning

confidence: 99%

Critical analysis of micro-thermogravimetry of CuSO_4·5H₂O crystals using heatable microcantilevers

Tiwary¹,

Zakerin²,

Natálio³

et al. 2019

J. Micromech. Microeng.

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Micro/nano thermogravimetry (TG) employing MEMS has significant potential to improve the minimum sample mass and mass resolution as compared to commercial TG instruments. Although there have been a few previous reports on MEMS TG, none of them have critically analysed the obtained TG curve in detail. In this work, we have designed and fabricated a microelectromechanical thermogravimetric device (MMTG) with integrated microheaters and temperature sensors. The mass sensitivity of the device was estimated to be 0.89 pg Hz −1 which outperforms the standard TG approaches. We tested the MMTG performance with CuSO 4 •5H 2 O crystals. The final mass loss ratio corresponds to the theoretically expected value, although the obtained TG curve deviated from the standard TG curve of CuSO 4 •5H 2 O obtained from commercial TG instruments. We attributed the deviation to the inherent temperature non-uniformity, non-isothermal conditions and temperature gradients of metallicwire based microheaters. Finite element (FE) simulations were carried out in order to confirm and gain insights into the non-uniform heating phenomena of microheater and sample. Based on the simulation results, we propose designs that can be realized to make MEMS TG a successful enterprise.

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Zipper model for the melting of thin films

Cited by 4 publications

References 26 publications

Fabrication of vertical van der Waals gap array using single-and multi-layer graphene

Fabrication of vertical van der Waals gap array using single-and multi-layer graphene

Conceptual Demonstration of Ambient Desorption-Optical Emission Spectroscopy Using a Liquid Sampling-Atmospheric Pressure Glow Discharge Microplasma Source

Critical analysis of micro-thermogravimetry of CuSO_4·5H₂O crystals using heatable microcantilevers

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Zipper model for the melting of thin films

Cited by 4 publications

References 26 publications

Fabrication of vertical van der Waals gap array using single-and multi-layer graphene

Fabrication of vertical van der Waals gap array using single-and multi-layer graphene

Conceptual Demonstration of Ambient Desorption-Optical Emission Spectroscopy Using a Liquid Sampling-Atmospheric Pressure Glow Discharge Microplasma Source

Critical analysis of micro-thermogravimetry of CuSO4·5H2O crystals using heatable microcantilevers

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Critical analysis of micro-thermogravimetry of CuSO_4·5H₂O crystals using heatable microcantilevers