Here is an article by mghpcc.org on NETlab’s work to improve thermoelectric conversion via quantum effects in nanostructures: http://www.mghpcc.org/exploring-thermoelectric-behavior-at-the-nanoscale/
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NETlab teaches workshop on thermoelectricity for highschoolers
As part of the UMass Summer ENGineering Institute (SENGI) for high school students, NETlab-ers Meenakshi, Arnab, and Prof. Aksamija taught a workshop on the principles of thermoelectric energy conversion. We all had loads of fun!
NETlab enjoys a group lunch at the University Club
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NETlab group members are (from left to right): Zlatan, Adithya, Justin, Venkatakrishna, Arnab, Meenakshi, and Cameron
NETlab collaboration with UIC and Northwestern U. published in Small
Our recent collaborative work with the Salehi-Khojin and Hersam groups at U. Illinois Chicago and Northwester, respectively, has been published in the Wiley journal “Small”. The article, titled “Direct Growth of High Mobility and Low-Noise Lateral MoS2–Graphene Heterostructure Electronics”, details our progress on the electronic properties of graphene/MoS2 heterojuctions for nanoelectronic device applications.
Arnab selected as “Best Poster” finalist at MRS Spring meeting
Congratulations to NETlab member and doctoral student Arnab Majee on his nomination for “Best Poster” award at the 2017 MRS Spring Meeting in Phoenix. Arnab presented his poster on ” Dynamical Thermal Conductivity in Single-Crystalline Graphene Ribbons” in the Nanoscale Heat Transfer session at MRS.
here is a link to the abstract
Ela and Cameron’s paper on graphene and MoS2 interface thermal transport published in Nanotechnology
The paper “Interface Thermal Conductance of van der Waals Monolayers on Amorphous Substrates” with NETlab alum Ela Correa and Cameron Foss has been accepted for publication in IOP’s journal Nanotechnology (IF=3.5). In it, we discuss our model for interface thermal conductance (ITC) between 2-dimensional materials graphene and MoS2 and amorphous SiO2 substrates. We discover that the flexural acoustic branch in graphene plays a significant role in ITC, but gets modified by the van der Waals interaction with the substrate. The findings will have an impact on heat dissipation in 2-d nanoelectronics. The accepted article can be accessed via this DOI link: https://doi.org/10.1088/1361-6528/aa5e3d
Interface thermal conductance between a monolayer and amorphous SiO2 substrate for graphene as a function of temperature T (a) and with relation to the spring coupling constant K_a dependence at T=300 K (b). Similarly for MoS_2 as a function of temperature T (c) and as a function of coupling constant K_a at room temperature (d).
NET Lab members enjoy a holiday lunch at Esselon Cafe
Cameron’s article on strained Si and Ge published in J. App. Phys
As dimensions of nanoelectronic devices become smaller, CPU hot spots become increasingly more difficult to manage. Applying mechanical strain in nanostructures provides an additional tuning mechanism for both electronic band structures and phonon dispersions that is independent of other methods such as alloying and dimensional confinement. By breaking crystal symmetry, strain increases anisotropy.
We present thermal conductivity calculations, performed in thin Si and Ge strained films, using first principles calculations of vibrational frequencies under biaxial strain, along with a phonon Boltzmann transport equation within the relaxation time approximation. We find that, while in-plane transport is not strongly dependent on strain, the cross-plane component of the thermal conductivity tensor shows a clear strain dependence, with up to 20% increase (decrease) at 4% compressive (tensile) strain in both Si and Ge. We also uncover that strain emphasizes the anisotropy between in-plane and cross-plane thermal conductivity across several orders of magnitude in film thickness. Read the article in J. Appl. Phys. here: http://dx.doi.org/10.1063/1.4971269
Our collaboration with U. Wisconsin and U. Hamburg published in Phys. Rev. Applied
We fabricate, measure, and simulate ultrathin diamond membranes with large lateral dimensions for MALDI TOF MS of high-mass proteins. With a minimal thickness of 100 nm and cross sections of up to 400×400 μm sq., the membranes offer extreme aspect ratios. Ion detection is demonstrated in MALDI TOF analysis over a broad range from insulin to albumin. The resulting data and simulations show much enhanced resolution as compared to existing detectors, which can offer better sensitivity and overall performance in resolving protein masses.
The article is available in Physical Review Applied: https://doi.org/10.1103/PhysRevApplied.6.064031
Meenakshi’s article on superdiffusion published in PRB
The latest article on phonon superdiffusion in Si-Ge alloy nanowires has been published in Physical Review B: https://doi.org/10.1103/PhysRevB.94.174303
