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Enhanced thermoelectric properties of topological crystalline insulator PbSnTe nanowires grown by vapor transport

Nano Research 2016年第3期9卷 820-830页

作者： Enzhi Xu Zhen Li jaime aviles acosta Nan Li Brian Swartzentruber ShiJian Zheng ,Nikolai Sinitsyn Han Htoon Jian Wang Shixiong Zhang Department of Physics Indiana University Bloomington Indiana 47405 USA Center for Integrated Nanotechnologies Materials Physics and Applications Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Center for Integrated Nanotechnologies Sandia National Laboratories Albuquerque New Mexico 87185 USA Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA MST-8 Los Alamos National Laboratory Los Alamos New Mexico 87545 USA

Bulk PbTe and alloy compounds thereof are well-known thermoelectric materials for electric power generation. Among these alloys, PbSnTe hosts unique topological surface states that may have improved thermoelectric properties. Here we report on the vapor-transport growth and thermoelectric study of high-quality single-crystalline PbTe and PbSnTe nanowires. The nanowires were grown along the 〈001〉 direction with dominant {100} facets; the chemical compositions of the wires depend strongly on the substrate position in the growth reactor. We measured the thermopower and electrical and thermal conductivities of individual nanowires to determine the thermoelectric figure of merit ZT. Compared to bulk samples, the PbSnTe nanowires showed both improved thermopower and suppressed thermal conductivity, enhancing the ZTs to -0.018 and N0.035 at room temperature. The enhanced thermopower may result from the unique topological surface states; the suppression of thermal conductivity may relate to increased phonon-surface scattering. Compared to PbTe nanowires, the PbSnTe wires have lower thermopower but significantly higher electrical conductivities. This study highlights nanostructuring in combination with alloying as an important approach to enhancing the figure of merit ZT of thermoelectric materials.

关键词： PbSnTe thermoelectrics topological crystallineinsulator nanowire

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Cardiac tamponade as a rare complication after giant coronary fistula percutaneous closure

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World Journal of Cardiovascular Diseases 2013年第2期3卷 215-217页

作者： Pablo Diez Villanueva Fernando Sarnago Cebada Enrique Gutierrez Ibanes Ricardo Sanz-Ruiz jaime Elizaga-Corrales Francisco Fernandez-aviles Cardiology Department Hospital General Universitario Gregorio MaranonMadridSpain

We present the case of an unusual complication after percutaneous closure of a giant coronary artery fis-tula. A 76-year-old man with previous admissions due to right heart failure and previous history of atrial fibrillation under acenocumarol, was admitted to our hospital for new onset of symptoms, characterized by progressive dyspnoea and peripheral edema. Physical examination revealed signs of congestive heart failure and a continuous murmur loudest along the lower sternal border. X-Ray showed cardiomegaly due to right chambers dilatation. Transthoracic echocardiography showed right chambers pressure and volume overload, with right ventricular enlargement and dysfunction, tricuspid annulus dilatation and severe tricuspid regurgitation. Cardiac catheterization showed significant elevation of right atrial pressure, as well as significant step-up of oxygen saturation in this chamber. Coronary angiography revealed the presence of a large fistula between the circumflex coronary artery (CCA) and coronary sinus (CS), with severe dilation of the CCA (maximum diameter20 mm). An Amplatzer? PDA was implanted in a distal elbow of the fistula with initailly good results. Anticoagulant therapy was then reinitiated, and a few days later, the patient developed clinical worsening of heart failure and dyspnoea. Echocardiogram showed significant pericardial effusion. Pleuropericardial window was then made draining a500 cm3 of bloody pericardial effusion. The postoperative outcome was excellent, with symptomatic relief and no signs of heart failure.

关键词： Giant Coronary Fistula Circumflex Coronary Artery Coronary Sinus Percutaneous Transcatheter Closure Pericardial Effusion Cardiac Tamponade

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