Xianjie Liu

Layer-by-Layer Assembled Heteroatom-Doped Graphene Films with Ultrahigh Volumetric Capacitance and Rate Capability for Micro-Supercapacitors

Highly uniform, ultrathin, layer-by-layer heteroatom (N, B) co-doped graphene films are fabricated for high-performance on-chip planar micro-supercapacitors with an ultrahigh volumetric capacitance of ∼488 F cm(-3) and excellent rate capability due to the synergistic effect of nitrogen and boron co-doping.

Detailed analysis of the mean diameter and diameter distribution of single-wall carbonnanotubes from their optical response

We report a detailed analysis of the optical properties of single-wall carbon nanotubes (SWCNTs) with different mean diameters as produced by laser ablation. From a combined study of optical absorption, high-resolution electron energy-loss spectroscopy in transmission, and tight-binding calculations we were able to accurately determine the mean diameter and diameter distribution in bulk SWCNT samples. In general, the absorption response can be well described assuming a Gaussian distribution of nanotube diameters and the predicted inverse proportionality between the nanotube diameter and the energy of the absorption features. A detailed simulation enabled not only a determination of the mean diameter of the nanotubes, but also gives insight into the chirality distribution of the nanotubes. The best agreement between the simulation and experiment is observed when only nanotubes within

Reduced diameter distribution of single-wall carbon nanotubes by selective oxidation

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Evidence for a New Two-Dimensional C4H-Type Polymer Based on Hydrogenated Graphene

of the armchair axis are considered. The mean diameters and diameter distributions from the optical simulations are in very good agreement with the values derived from other bulk sensitive methods such as electron diffraction, x-ray diffraction, and Raman scattering.

An Organic Mixed Ion–Electron Conductor for Power Electronics

We report an easy way to narrow the diameter distribution of single-walled carbon nanotubes (SWNT) by oxidization treatments. Both a chemical treatment in 2 M HNO3 as well as oxidation in a reduced O2 atmosphere lead to a selective burning of the narrower SWNT in bulk samples and to a diameter distribution which is smaller by a factor of two. This is a first important step towards a selective production of SWNT with a defined diameter on a bulk scale.

Efficient Spin Injection Through Exchange Coupling at Organic Semiconductor/Ferromagnet Heterojunctions

www.MaterialsViews.com C O M M U N IC A IO N Danny Haberer , * Cristina E. Giusca , Ying Wang , Hermann Sachdev , * Alexander V. Fedorov , Mani Farjam , S. Akbar Jafari , Denis V. Vyalikh , Dmitry Usachov , Xianjie Liu , Uwe Treske , Mandy Grobosch , Oleg Vilkov , Vera K. Adamchuk , Stephan Irle , * S. Ravi P. Silva , Martin Knupfer , Bernd Büchner , and Alexander Grüneis * Evidence for a New Two-Dimensional C 4 H-Type Polymer Based on Hydrogenated Graphene

The role of aluminum oxide buffer layer in organic spin-valves performance

A mixed ionic–electronic conductor based on nanofibrillated cellulose composited with poly(3,4‐ethylene‐dioxythiophene):poly(styrene‐sulfonate) along with high boiling point solvents is demonstrated in bulky electrochemical devices. The high electronic and ionic conductivities of the resulting nanopaper are exploited in devices which exhibit record values for the charge storage capacitance (1F) in supercapacitors and transconductance (1S) in electrochemical transistors.

Synthesis of Novel CuO Nanosheets and Their Non-Enzymatic Glucose Sensing Applications

The schematic visualization of the Alq(3) molecule on the Fe substrate with the optimized geometry at lowest total energy. When the Alq(3) molecule is relaxed on the surface, only two of the wings are lying down on the Fe surface, and the third wing remains perpendicular to the surface, showing a strong hybridization occurance.

Poly(ethylene imine) impurities induce n-doping reaction in organic (semi)conductors

The electronic structures of the 8-hydroxyquinoline-aluminum (Alq(3))/Al2O3/Co interfaces were studied by photoelectron spectroscopy. A strong interface dipole was observed, which leads to a reduct ...

Alternating current dielectrophoresis of carbon nanotubes

In this study, we have developed a sensitive and selective glucose sensor using novel CuO nanosheets which were grown on a gold coated glass substrate by a low temperature growth method. X-ray differaction (XRD) and scanning electron microscopy (SEM) techniques were used for the structural characterization of CuO nanostructures. CuO nanosheets are highly dense, uniform, and exhibited good crystalline array structure. X-ray photoelectron spectroscopy (XPS) technique was applied for the study of chemical composition of CuO nanosheets and the obtained information demonstrated pure phase CuO nanosheets. The novel CuO nanosheets were employed for the development of a sensitive and selective non-enzymatic glucose sensor. The measured sensitivity and a correlation coefficient are in order 5.20 × 102 μA/mMcm2 and 0.998, respectively. The proposed sensor is associated with several advantages such as low cost, simplicity, high stability, reproducibility and selectivity for the quick detection of glucose.