Publications

Continuously Controlled Optical Band Gap in Oxide Semiconductor Thin Films

Journal: Nano Letters

The optical band gap of the prototypical semiconducting oxide SnO2 is shown to be continuously controlled through single axis lattice expansion of nanometric films induced by low-energy helium implantation. While traditional epitaxy-induced strain results in Poisson driven multidirectional lattice...

Separation of Distinct Photoexcitation Species in Femtosecond Transient Absorption Microscopy

Journal: ACS Photonics

Femtosecond transient absorption microscopy is a novel chemical imaging capability with simultaneous high spatial and temporal resolution. Although several powerful data analysis approaches have been developed and successfully applied to separate distinct chemical species in such images, the application of such...

Two-dimensional Ga/Se/MoSe2 misfit bilayer heterojunctions by van der Waals epitaxy

Journal: Science Advances

Two-dimensional (2D) heterostructures hold the promise for future atomically thin electronics and optoelectronics because of their diverse functionalities. Although heterostructures consisting of different 2D materials with well-matched lattices and novel physical properties have been successfully fabricated via...

Tire-derived carbon composite anodes for sodium-ion batteries

Journal: Journal of Power Sources

Hard-carbon materials are considered as one of the most promising anodes for the emerging sodium-ion batteries. Here, we report a low-cost, scalable waste tire-derived carbon as an anode for sodium-ion batteries (SIBs). Tire-derived carbons obtained by pyrolyzing acid-treated tire at 1100 C, 1400 C and 1600 C show...

Unraveling the Mechanism of Nanoscale Mechanical Reinforcement in Glassy Polymer Nanocomposites

Journal: Nano Letters

The mechanical reinforcement of polymer nanocomposites (PNCs) above the glass transition temperature, Tg, has been extensively studied. However, not much is known about the origin of this eff ect below Tg . In this Letter, we unravel the mechanism of PNC reinforcement within the glassy state...

Tailoring synthesis of high-vacancy MoSe2-x monolayer crystals

Journal: Nano Letters

Defect engineering has been a critical step in controlling the transport characteristics of electronic devices, and the ability to create, tune, and annihilate defects is essential to enable the range of next-generation devices. Whereas defect formation has been well-demonstrated in three-dimensional semiconductors...

Superior Conductive Solid-like Electrolytes: Nanoconfining Liquids within the Hollow Structures

Journal: Nano Letters

The growth and proliferation of lithium (Li) dendrites during cell recharge are currently unavoidable, which seriously hinders the development and application of rechargeable Li metal batteries. Solid electrolytes with robust mechanical modulus are regarded as a promising approach to overcome the dendrite problems...

The role of electronic energy loss in ion beam modification of materials

Journal: Curr. Opin. Solid State Mater. Sci.

Illustrated are combined effects of energy loss to electrons and atomic nuclei by an ion. Electronic energy loss results in a concentric thermal spike along the ion path (depicted by arrow), while energy loss to atomic nuclei results in atomic collisions that displace atoms creating damage (different...

An Iodide-Based Li7P2S8I Superionic Conductor

Journal: J. Am. Chem. Soc.

SEM images of (a) surface and (b) cross section of a warm pressed Li7P2S8I membrane, showing a highly dense network with no observed voids. (hi-res image) In an example of stability from instability, a Li7P2S8I solid-state Li-ion conductor derived from β-Li3PS4 and LiI demonstrates electrochemical...

Controlled Shape Memory Behavior of a Smectic Main-Chain Liquid Crystalline Elastomer

Journal: Macromolecules

A smectic main-chain liquid crystalline elastomer (LCE), with controlled shape memory behavior, is synthesized by polymerizing a biphenyl-based epoxy monomer with an aliphatic carboxylic acid curing agent. Microstructures of the LCEs, including their liquid crystallinity and cross-linking density, are modified by...

Understanding How Processing Additives Tune the Nanoscale Morphology of High Efficiency Organic Photovoltaic Blends: From Casting Solution to Spun-Cast Thin Film

Journal: Adv. Funct. Mater.

Adding a small amount of a processing additive to the casting solution of photoactive organic blends has been demonstrated to be an effective method for achieving improved power conversion efficiency (PCE) in organic photovoltaics (OPVs). However, an understanding of the nano-structural evolution occurring in the...

Role of Surface Structure on Li-ion Energy Storage Capacity of Two-dimensional Transition Metal Carbides

Journal: J. Am. Chem. Soc.

A combination of density functional theory (DFT) calculations and experiments is used to shed light on the relation between surface structure and Li-ion storage capacities of the following functionalized two-dimensional (2D) transition-metal carbides or MXenes: Sc2C, Ti2C, Ti3C...

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