PNAS (Chemistry)

/PNAS (Chemistry)

Sequentially bridged graphene sheets with high strength, toughness, and electrical conductivity [Chemistry]

2018-05-29T12:50:09+00:00May 29th, 2018|Categories: Publications|Tags: |

We here show that infiltrated bridging agents can convert inexpensively fabricated graphene platelet sheets into high-performance materials, thereby avoiding the need for a polymer matrix. Two types of bridging agents were investigated for interconnecting graphene sheets, which attach to sheets by either π–π bonding or covalent bonding. When applied alone,…

Published in: "PNAS".

High-order fractal states in graphene superlattices [Physics]

2018-05-15T20:24:28+00:00May 15th, 2018|Categories: Publications|Tags: |

Graphene superlattices were shown to exhibit high-temperature quantum oscillations due to periodic emergence of delocalized Bloch states in high magnetic fields such that unit fractions of the flux quantum pierce a superlattice unit cell. Under these conditions, semiclassical electron trajectories become straight again, similar to the case of zero magnetic…

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Widespread changes in transcriptome profile of human mesenchymal stem cells induced by two-dimensional nanosilicates [Engineering]

2018-04-24T20:24:31+00:00April 24th, 2018|Categories: Publications|Tags: |

Two-dimensional nanomaterials, an ultrathin class of materials such as graphene, nanoclays, transition metal dichalcogenides (TMDs), and transition metal oxides (TMOs), have emerged as a new generation of materials due to their unique properties relative to macroscale counterparts. However, little is known about the transcriptome dynamics following exposure to these nanomaterials….

Published in: "PNAS".

Expressway to partially oxidized phosphorene [Chemistry]

2018-04-24T20:24:30+00:00April 24th, 2018|Categories: Publications|Tags: |

Few-layer black phosphorus or phosphorene is an intriguing and important 2D material. It is a single-layer material that consists of corrugated and condensed six-membered phosphorus rings (Fig. 1). Each phosphorene layer can be weakly bonded to neighboring ones by van der Waals-like interactions to form few-layer arrangements, which are also…

Published in: "PNAS".

Facile bottom-up synthesis of partially oxidized black phosphorus nanosheets as metal-free photocatalyst for hydrogen evolution [Chemistry]

2018-04-24T20:24:29+00:00April 24th, 2018|Categories: Publications|Tags: |

Few-layer black phosphorus (BP) nanosheets were first reported as a 2D material for the application of field-effect transistors in 2014 and have stimulated intense activity among physicists, chemists, and material and biomedical scientists, driving research into novel synthetic techniques to produce BP nanosheets. At present, exfoliation is the main route…

Published in: "PNAS".

Full superconducting dome of strong Ising protection in gated monolayer WS2 [Applied Physical Sciences]

2018-04-03T20:24:32+00:00April 3rd, 2018|Categories: Publications|Tags: |

Many recent studies show that superconductivity not only exists in atomically thin monolayers but can exhibit enhanced properties such as a higher transition temperature and a stronger critical field. Nevertheless, besides being unstable in air, the weak tunability in these intrinsically metallic monolayers has limited the exploration of monolayer superconductivity,…

Published in: "PNAS".

Graphene-based bimorphs for micron-sized, autonomous origami machines [Applied Physical Sciences]

2018-01-16T20:24:32+00:00January 16th, 2018|Categories: Publications|Tags: |

Origami-inspired fabrication presents an attractive platform for miniaturizing machines: thinner layers of folding material lead to smaller devices, provided that key functional aspects, such as conductivity, stiffness, and flexibility, are persevered. Here, we show origami fabrication at its ultimate limit by using 2D atomic membranes as a folding material. As…

Published in: "PNAS".

Novel concept of the smart NIR-light-controlled drug release of black phosphorus nanostructure for cancer therapy [Applied Biological Sciences]

2018-01-16T20:24:31+00:00January 16th, 2018|Categories: Publications|Tags: |

A biodegradable drug delivery system (DDS) is one the most promising therapeutic strategies for cancer therapy. Here, we propose a unique concept of light activation of black phosphorus (BP) at hydrogel nanostructures for cancer therapy. A photosensitizer converts light into heat that softens and melts drug-loaded hydrogel-based nanostructures. Drug release…

Published in: "PNAS".

Mechanism of ion adsorption to aqueous interfaces: Graphene/water vs. air/water [Chemistry]

2017-12-19T20:24:33+00:00December 19th, 2017|Categories: Publications|Tags: , |

The adsorption of ions to aqueous interfaces is a phenomenon that profoundly influences vital processes in many areas of science, including biology, atmospheric chemistry, electrical energy storage, and water process engineering. Although classical electrostatics theory predicts that ions are repelled from water/hydrophobe (e.g., air/water) interfaces, both computer simulations and experiments…

Published in: "PNAS".

Enhanced antibacterial activity through the controlled alignment of graphene oxide nanosheets [Environmental Sciences]

2017-11-14T20:24:46+00:00November 14th, 2017|Categories: Publications|Tags: , |

The cytotoxicity of 2D graphene-based nanomaterials (GBNs) is highly important for engineered applications and environmental health. However, the isotropic orientation of GBNs, most notably graphene oxide (GO), in previous experimental studies obscured the interpretation of cytotoxic contributions of nanosheet edges. Here, we investigate the orientation-dependent interaction of GBNs with bacteria…

Published in: "PNAS".

Ballistic thermophoresis of adsorbates on free-standing graphene [Applied Physical Sciences]

2017-08-22T20:24:34+00:00August 22nd, 2017|Categories: Publications|Tags: |

The textbook thermophoretic force which acts on a body in a fluid is proportional to the local temperature gradient. The same is expected to hold for the macroscopic drift behavior of a diffusive cluster or molecule physisorbed on a solid surface. The question we explore here is whether that is…

Published in: "PNAS".

Caffeine induces gastric acid secretion via bitter taste signaling in gastric parietal cells [Physiology]

2017-07-31T20:24:27+00:00July 31st, 2017|Categories: Publications|

Caffeine, generally known as a stimulant of gastric acid secretion (GAS), is a bitter-tasting compound that activates several taste type 2 bitter receptors (TAS2Rs). TAS2Rs are expressed in the mouth and in several extraoral sites, e.g., in the gastrointestinal tract, in which their functional role still needs to be clarified….

Published in: "PNAS".

Electron coherence in MoS2 induced by SSPM [Physics]

2015-09-22T18:15:11+00:00September 22nd, 2015|Categories: Publications|Tags: |

Generating electron coherence in quantum materials is essential in optimal control of many-body interactions and correlations. In a multidomain system this signifies nonlocal coherence and emergence of collective phenomena, particularly in layered 2D quantum materials possessing novel electronic structures and high carrier mobilities. Here we report nonlocal ac electron coherence…

Superconductivity in Li-decorated graphene [Physics]

2016-10-15T11:24:40+00:00September 22nd, 2015|Categories: Publications|Tags: |

Monolayer graphene exhibits many spectacular electronic properties, with superconductivity being arguably the most notable exception. It was theoretically proposed that superconductivity might be induced by enhancing the electron–phonon coupling through the decoration of graphene with an alkali adatom superlattice [Profeta G, Calandra M, Mauri F (2012) Nat Phys 8(2):131–134]. Although…

Topological Bloch bands in graphene superlattices [Physics]

2015-09-01T22:15:07+00:00September 1st, 2015|Categories: Publications|Tags: , |

We outline a designer approach to endow widely available plain materials with topological properties by stacking them atop other nontopological materials. The approach is illustrated with a model system comprising graphene stacked atop hexagonal boron nitride. In this case, the Berry curvature of the electron Bloch bands is highly sensitive…

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