نتایج جستجو برای: fe doped nanotube

تعداد نتایج: 140621  

2004
Sittichai Natesakhawat Xueqin Wang Umit S. Ozkan

Hydrogen generation technologies have become increasingly important due to recent attention focusing on fuel cells. The water-gas shift reaction, which is performed in two stages as highand low-temperature shift, is of central significance to produce highpurity hydrogen. Generally, the high-temperature water-gas shift reaction (HTS) is conducted on Fe-Cr catalysts. However, these catalytic syst...

Journal: :Nanoscale 2015
Xianliang Wang Qing Li Hengyu Pan Ye Lin Yujie Ke Haiyang Sheng Mark T Swihart Gang Wu

We demonstrate a new strategy for tuning the size of large-diameter and few-walled nitrogen-doped carbon nanotubes (N-CNTs) from 50 to 150 nm by varying the transition metal (TM = Fe, Co, Ni or Mn) used to catalyze graphitization of dicyandiamide. Fe yielded the largest tubes, followed by Co and Ni, while Mn produced a clot-like carbon morphology. We show that morphology is correlated with elec...

Journal: :Physical chemistry chemical physics : PCCP 2010
Elena Borghi Manlio Occhiuzzi Elisabetta Foresti Isidoro Giorgio Lesci Norberto Roveri

Fe-doped synthetic geomimetic chrysotile nanocrystals represent a reference standard to investigate the health hazard associated with asbestos fibers and constitute interesting inorganic nanotubes for specific technological applications in light harvesting systems, optoelectronics and photonics. As the fiber toxicity is catalyzed by iron ions in specific crystallographic sites and the mechanica...

2014
Min-Hua Chen Tomohiko Yoshioka Toshiyuki Ikoma Nobutaka Hanagata Feng-Huei Lin Junzo Tanaka

Theranostic nanoparticles currently have been regarded as an emerging concept of 'personalized medicine' with diagnostic and therapeutic dual-functions. Eu3+ doped hydroxyapatite (HAp) has been regarded as a promising fluorescent probe for in vivo imaging applications. Additionally, substitution of Ca2+ with Fe3+ in HAp crystal may endow the capability of producing heat upon exposure to a magne...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علم و صنعت ایران 1380

در این پایان نامه خواص و جنبه های مختلف کربن معرفی و مروری کلی بر روشهای ساخت ، ساختار و خواص انواع مختلف کربن از کربنهای bulk(شامل گرافیت ، گرافیت turbostratic، الیاف کربن، دوده هاو ... ) تا کربنهای نانومقیاس (شامل fullerenes ، کپسولهای نانومقیاس ، کربنهای nanotube و ... ) ارائه می شود. عمده کار متوجه کربنهای nanotube(اعم از multi-wall و single-wall ) است و ساختار ، عیوب شبکه ای و روشهای ساخت ...

2002
Gun-Do Lee Seungwu Han Jaejun Yu Jisoon Ihm

The catalytic decomposition process in the initial stage of carbon nanotube ~CNT! growth is investigated for the system of acetylene (C2H2) on the Fe~001! surface through first-principles electronic structure calculation. In its most stable configuration, the C-C bond of C2H2 is lying on the hollow site along the @110# direction of the Fe~001! surface. The formation of the CH fragments accompan...

2010
Chatchawal Wongchoosuk Anurat Wisitsoraat Ditsayut Phokharatkul Adisorn Tuantranont Teerakiat Kerdcharoen

In this work we have fabricated hydrogen gas sensors based on undoped and 1 wt% multi-walled carbon nanotube (MWCNT)-doped tungsten oxide (WO(3)) thin films by means of the powder mixing and electron beam (E-beam) evaporation technique. Hydrogen sensing properties of the thin films have been investigated at different operating temperatures and gas concentrations ranging from 100 ppm to 50,000 p...

2009
Li-Fang Zhu

We investigate structural, magnetic, and electronic properties of SrFeAsF as a new parent for superconductors using a state-of-the-art density-functional theory method. Calculated results show that the striped antiferromagnetic order is the magnetic ground state in the Fe layer and the interlayer magnetic interaction is tiny. Calculated As and Sr positions are in good agreement with experiment....

Journal: :Scientific reports 2015
Liangbao Jiang Shifeng Jin Wenjun Wang Sibin Zuo Zhilin Li Shunchong Wang Kaixing Zhu Zhiyi Wei Xiaolong Chen

Aluminum nitride (AlN) is a well known wide-band gap semiconductor that has been widely used in fabricating various ultraviolet photo-electronic devices. Herein, we demonstrate that a fiber laser can be achieved in Fe-doped AlN fiber where Fe is the active ion and AlN fiber is used as the gain medium. Fe-doped single crystal AlN fibers with a diameter of 20-50 μm and a length of 0.5-1 mm were p...

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