Nano/Microscale Thermal Field Distribution: Conducting Thermal Decomposition of Pyrolytic-Type Polymer by Heated AFM Probes
Abstract
:1. Introduction
2. Materials and Methods
2.1. Polyphthalaldehyde (PPA) Films
2.2. Atomic Force Microscopy
2.3. Thermal Expansion Measurements
2.4. Heat-Induced decomposition
3. Results and Discussion
3.1. Heat Induced Localized PPA Decomposition
3.2. Simplified Steady State 3D Model
- (1)
- Contact heat transfer: contact heat transfer at the tip–sample interface causes surface decomposition of the PPA material and produces a nano-scale air gap.
- (2)
- Thermal radiation: when the tip–sample distance is in the nanoscale at the beginning of the formation of the air gap, there is a very remarkable phenomenon of thermal radiation. However, the exact effective dimension of the thermal radiation range is hard to determine.
- (3)
- Convection heat transfer: nanomaterial PPA decomposition is accompanied by solid–gas phase transition. When the air gap structure expands, there will be a convective heat transfer layer on the surface of the material, the thickness of which is related to the decomposition speed.
- (4)
- The latent heat of phase transition: the solid–gas phase transition on the surface of the PPA material is always in existence. However, it has not been carried out under equal pressure in the gradually expanding micro-nano-scale air gap. Therefore, the latent heat of phase change is difficult to calculate by the time derivative of the volume change of the material.
- (5)
- Air gap medium heat transfer: in all of the heat transfer processes described in 2), 3), and 4), there has always existed a heat conduction of the heated tip to the PPA surface through the sub-continuous air medium, whereas the thermal conductivity of the air medium due to the nanoscale effect is most likely anisotropic in the air gap space, early in the heating time. Moreover, the heat transfer through air is shown to be dependent on the sample thermal conductivity [41].
- (1)
- The system is in a steady-state;
- (2)
- The very small part near the spherical tip peak with a pyramidal geometry shape and a preset temperature T1 can be regard as the heat source of air gap heat transfer;
- (3)
- The latent heat of cooling on the convective surface can be neglected [33]; and
- (4)
- Phase changes can be neglected.
4. Conclusions
- (i)
- Different nano/microscale pyramid air gaps with an approximately rhombic surface contour were formed on the surface of the PPA film by the thermal effect of the heated tip with its location holding at the initial contact point and temperature ranging from 190 to 220 °C for the various heating durations (0–120 s). The air gap horizontal and vertical dimensions ranged from 235 ± 13.8 to 1412 ± 19.6 nm and 6.6 ± 2.0 to 256.5 ± 1.5 nm, respectively.
- (ii)
- The heat transfer in the horizontal and vertical directions was estimated from the variable air gap dimensions. In the air gap between the heated tip and sample surface, the horizontal was greater when compared with the vertical heat transport, and the horizontal thermal transfer was not always symmetric and the deviation appeared on the further side from the cantilever fixed end, which was determined by the air gap heat transfer mode, tip geometry shape, and the cantilever mounting angle. The position of the 188 °C isothermal surface of the steady-state temperature field in air gaps was quantitatively determined by our experimental method. The maximum space range of the air gap temperature field in our investigation was horizontal at ~700 nm and vertical at ~250 nm.
- (iii)
- A simplified model of the 3D steady-state thermal field for the nano/microscale air gap was established and the boundary condition was obtained by measuring the feature sizes of the air gap structures. The temperature distribution could be calculated by the model, and the results showed that the higher the preset tip temperature, the steeper the temperature gradient close to the tip peak. By using our simplified model, the temperature distribution could be quantitatively calculated with only the measurements of the air gap feature sizes without measuring the tip geometry shape, the cantilever mounting angle, and the system (heatable tip, medium, and sample material) heat conduction characteristics, which is a useful simplification for the investigation of complex heat transfer problems in the nano/microscale air gap.
- (iv)
- Based on the calculation of our model, we fabricated programmable nano/microscale (20–1500 nm) pyramid structures on the PPA film. The structure dimensions were designed by controlling the temperature field around the heated tip. The processed structures had great consistency and repeatability, thus may be a potential application of nanofabrication based on SThM.
Author Contributions
Funding
Conflicts of Interest
References
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Li, B.; Geng, Y.; Yan, Y. Nano/Microscale Thermal Field Distribution: Conducting Thermal Decomposition of Pyrolytic-Type Polymer by Heated AFM Probes. Nanomaterials 2020, 10, 483. https://doi.org/10.3390/nano10030483
Li B, Geng Y, Yan Y. Nano/Microscale Thermal Field Distribution: Conducting Thermal Decomposition of Pyrolytic-Type Polymer by Heated AFM Probes. Nanomaterials. 2020; 10(3):483. https://doi.org/10.3390/nano10030483
Chicago/Turabian StyleLi, Bo, Yanquan Geng, and Yongda Yan. 2020. "Nano/Microscale Thermal Field Distribution: Conducting Thermal Decomposition of Pyrolytic-Type Polymer by Heated AFM Probes" Nanomaterials 10, no. 3: 483. https://doi.org/10.3390/nano10030483
APA StyleLi, B., Geng, Y., & Yan, Y. (2020). Nano/Microscale Thermal Field Distribution: Conducting Thermal Decomposition of Pyrolytic-Type Polymer by Heated AFM Probes. Nanomaterials, 10(3), 483. https://doi.org/10.3390/nano10030483