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The effects of isovalent doping on the superconducting transition temperature Tc in novel 112-type iron arsenide Ca1-xLaxFeAs2 were studied by conducting measurements of electrical resistivity rho and magnetization M. P or Sb doping…

We report that entirely end-bonded multi-walled carbon nanotubes (MWNTs) can show superconductivity with the transition temperature Tc as high as 12K that is approximately 40-times larger than those reported in ropes of single-walled…

超导电性 · 物理学 2009-11-11 I. Takesue , J. Haruyama , N. Kobayashi , S. Chiashi , S. Maruyama , T. Sugai , H. Shinohara

A series of solid organic acids were used to p-dope carbon nanotubes. The extent of doping is shown to be dependent on the pKa value of the acids. Highly fluorinated carboxylic acids and sulfonic acids are very effective in shifting the…

材料科学 · 物理学 2015-07-20 Christian Klinke , Ali Afzali , Phaedon Avouris

Understanding the doping evolution from a Mott insulator to a superconductor probably holds the key for resolving the mystery of unconventional superconductivity in copper oxides. To elucidate the evolution of the electronic state starting…

超导电性 · 物理学 2023-09-19 Han Li , Zhaohui Wang , Shengtai Fan , Huazhou Li , Huan Yang , Hai-Hu Wen

Spontaneous entry of water molecules inside single-wall carbon nanotubes (SWCNTs) has been confirmed by both simulations and experiments. Using molecular dynamics simulations, we have studied the thermodynamics of filling of a (6,6) carbon…

介观与纳米尺度物理 · 物理学 2015-01-27 Hemant Kumar , Chandan Dasgupta , Prabal K. Maiti

Single-walled carbon nanotubes are promising nanoelectronic materials but face long-standing challenges including production of pure semiconducting SWNTs and integration into ordered structures. Here, highly pure semiconducting…

p-type doping from the dielectric/semiconductor interface of a SnO2 thin film transistor (TFT) has been utilized to develop high carrier mobility balanced ambipolar oxide-transistor. To introduce this interfacial-doping, bottom-gate…

应用物理 · 物理学 2020-01-07 Nitesh K. Chourasia , Anand Sharma , Nila Pal , Sajal Biring , Bhola N. Pal

High filling of single wall carbon nanotubes (SWCNT) with C$_{60}$ and C$_{70}$ fullerenes in solvent is reported at temperatures as low as 69 $^{o}$C. A 2 hour long refluxing in n-hexane of the mixture of the fullerene and SWCNT results in…

材料科学 · 物理学 2016-08-16 F. Simon , H. Kuzmany , H. Rauf , T. Pichler , J. Bernardi , H. Peterlik , L. Korecz , F. Fülöp , A. Jánossy

In this work, we investigate the electrical conductivity of carbon nanotubes (CNTs), with a particular focus on the effects of doping. Using a first-principles approach, we study the electronic structure, phonon dispersion, and…

材料科学 · 物理学 2024-08-07 Mina Yoon , German D. Samolyuk , Kai Li , James A. Hayne , Tolga Aytug

In cuprate superconductors, the doping of carriers into the parent Mott insulator induces superconductivity and various other phases whose characteristic temperatures are typically plotted versus the doping level $p$. In most materials, $p$…

The conductivity of carbon nanotube (CNT) networks can be improved markedly by doping with nitric acid. In the present work, CNTs and junctions of CNTs functionalized with NO$_3$ molecules are investigated to understand the microscopic…

应用物理 · 物理学 2018-03-21 T. Ketolainen , V. Havu , E. Ö. Jónsson , M. J. Puska

An oxygen assisted hydrocarbon chemical vapor deposition (CVD) method is developed to afford large-scale highly reproducible ultra high-yield growth of vertical single-walled carbon nanotubes (SWNT). It is revealed that reactive hydrogen…

$\beta$-Ga$_2$O$_3$ is gaining attention as a promising semiconductor for next-generation high-power, high-efficiency, and high-temperature electronic devices, thanks to its exceptional material properties. However, challenges such as the…

应用物理 · 物理学 2025-03-31 Hunter D. Ellis , Botong Li , Haoyu Xie , Jichao Fan , Imteaz Rahaman , Weilu Gao , Kai Fu

Recent studies have demonstrated ambient pressure superconductivity in compressively strained La$_{3}$Ni$_{2}$O$_{7}$ thin films, yet the phase diagram of heterovalent doping$-$critical for advancing the field$-$remains unexplored. Here, we…

Metal catalysts play a pivotal role in the growth of single-walled carbon nanotubes (SWCNTs), with binary metallic catalysts emerging as an efficient SWCNT synthesis strategy. Among these, iron (Fe), cobalt (Co), and their alloys are…

Electrically-tunable optical properties in materials are desirable for many applications ranging from displays to lasing and optical communication. In most two-dimensional thin-films and other quantum confined materials, these constants…

Photoconductivity of single-crystalline selenium nanotubes (SCSNT) under a range of illumination intensities of a 633nm laser is carried out with a novel two terminal device arrangement at room temperature. It's found that SCSNT forms…

材料科学 · 物理学 2008-06-18 Peng Liu , Yurong Ma , Weiwei Cai , Zhenzhong Wang , Limin Qi , Dongmin Chen

The electronic breakdown and the bias dependence of the conductance have been investigated for a large number of catalytic chemical vapor deposition (CCVD) grown single-walled carbon nanotubes (SWCNTs) with very small diameters. The…

材料科学 · 物理学 2009-11-10 R. V. Seidel , A. P. Graham , B. Rajasekharan , E. Unger , M. Liebau , G. S. Duesberg , F. Kreupl , W. Hoenlein

The optoelectronic properties of single- and double-wall carbon nanotubes (CNTs) noncovalently functionalized with tetraphenylporphyrins (TPPs) are addressed by dispersion-corrected ab initio calculations. Five CNT species with different…

材料科学 · 物理学 2017-01-04 Walter Orellana

The advancements of nanomaterials or nanostructures have enabled the possibility of fabricating multifunctional materials that hold great promises in engineering applications. The carbon nanotube (CNT)-based nanostructure is one…

计算物理 · 物理学 2015-05-22 Haifei Zhan , John M. Bell , Yuantong Gu