A5026062020- Thermal properties of materials
- Advanced Thermoelectric Materials and Devices
- Thermal Radiation and Cooling Technologies
- Silicon Nanostructures and Photoluminescence
- Anodic Oxide Films and Nanostructures
- Advanced Thermodynamics and Statistical Mechanics
- Adhesion, Friction, and Surface Interactions
- Semiconductor materials and interfaces
- Archaeology and Natural History
- Chemical and Physical Properties of Materials
- Silicon and Solar Cell Technologies
- Transition Metal Oxide Nanomaterials
- Nanopore and Nanochannel Transport Studies
- Semiconductor materials and devices
- Remote Sensing and Land Use
- Environmental Changes in China
- Environmental Quality and Pollution
- Thermodynamic and Structural Properties of Metals and Alloys
- Carbon Nanotubes in Composites
- Advanced Semiconductor Detectors and Materials
- Near-Field Optical Microscopy
University of Arizona
2020-2023
Master's College
2022
Nanocarbon materials have been widely used for nanoelectronics and energy-related applications. In this work, composite films consisting of reduced graphene oxides (rGOs) single-wall carbon nanotubes (SWCNTs) are synthesized studied their in-plane thermal conductivities. Different from pristine or with decreased conductivities above 300 K, the these found to follow trend specific heat 100 400 i.e., monotonously increasing at elevated temperatures. Such a can often be within amorphous solids...
Nanograined bulk alloys based on bismuth telluride (Bi2Te3) are the dominant materials for roomtemperature thermoelectric applications.In numerous studies, existing phonon mean free path (MFP) spectra predicted by atomistic simulations suggest sub-100 nm grain sizes necessary to reduce lattice thermal conductivity decreasing MFPs.This is in contrast with available experimental data, where a remarkable reduction observed even micro-grained Bi2Te3 samples.In this work, first-principles MFPs...
Phonon transport across an interface is of fundamental importance to applications ranging from electronic and optical devices thermoelectric materials. The phonon scattering by can dramatically suppress the thermal transport, which benefit but create problems for management electronic/optical devices. In this aspect, existing molecular dynamics simulations on various interfaces are often based estimates atomic structures seldom compared with measurements real interfaces. work, planar Si/Ge...
At the atomic level, heat is viewed as energy for lattice vibrational waves, i.e., a mechanical wave. Correspondingly, strain displacement can have profound impact on thermal transport. Despite numerous atomistic simulations, fewer experimental efforts be found strain-dependent properties of individual nanostructures and thin films. In this work, suspended 2 μm-thick Si films were stretched to reveal influence uniaxial tensile in-plane conductivity along stretching direction. high vacuum,...
Nanoporous materials (sub-10 nm in diameter) have potential applications chips, biosensors, thermoelectrics, desalination and other fields due to their large surface-to-volume ratio. Thermal annealing is a preferred technique precisely control the ultra-fine nanopore size. Here, 3D morphological evolution of membrane with periodic nanopores by thermal studied. It found that determined combination thickness, initial radius length porous pattern, rather than previously suggested ratio between...
Heat exchange between a solid material and the gas environment is critical for heat dissipation of miniature electronic devices. In this aspect, existing experimental studies focus on non-porous structures such as thin films, nanotubes, wires. work, proposed two-layer model transfer coefficient (HTC) sample surrounding air extended to 70-nm-thick nanoporous Si films that are patterned with periodic rectangular nanopores having feature sizes 100–400 nm. The HTC values extracted using 3ω...
In recent years, nanoporous Si films have been intensively studied for their potential applications in thermoelectrics and the thermal management of devices. To minimize conductivity, ultrafine patterns are required but smallest structure size is largely limited by spatial resolution employed nanofabrication techniques. Along this line, an effectively smaller characteristic length a film can be achieved with offset nanoslot patterns. Compared periodic circular pores, pattern achieve even...
The purpose of this paper is to grasp the distribution characteristics arable land quality. Methods employed are system analysis method and spatial function ArcGIS. results show that quality relatively higher compared national level. Differences grade were significant among different agricultural grading zones. Han River plain area highest. grades irrigable paddy field than dry land, Topography, soil, irrigation conditions, population density, economic development level main factors causing...
As one simple metamaterial, nanopatterns are often fabricated across a thin film so that the thermal transport can be manipulated. The etched sidewalls for these nanostructures usually rough due to surface defects introduced during nanofabrication, whereas top and bottom surfaces smoother. In existing analytical models, contrast between has not been addressed all boundaries assumed diffusive phonon reflection. this paper, new two-step approach address issue is proposed modeling of general...
Nanograined bulk alloys based on bismuth telluride (Bi2Te3) are the dominant materials for room-temperature thermoelectric applications. In numerous studies, existing phonon mean free path (MFP) spectra predicted by atomistic simulations suggest sub-100 nm grain sizes necessary to reduce lattice thermal conductivity decreasing MFPs. This is in contrast with available experimental data, where a remarkable reduction observed even micro-grained Bi2Te3 samples. this work, first-principles MFPs...