Are Nanoporous Materials Radiation Resistant?

被引：219

作者：

Bringa, E. M. ^{[2
,3
]}

Monk, J. D. ^{[4
]}

Caro, A. ^{[1
]}

Misra, A. ^{[1
]}

Zepeda-Ruiz, L. ^{[5
]}

Duchaineau, M. ^{[5
]}

Abraham, F. ^{[5
]}

Nastasi, M. ^{[1
]}

Picraux, S. T. ^{[1
]}

Wang, Y. Q. ^{[1
]}

Farkas, D. ^{[6
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM USA

[2] Univ Nacl Cuyo, CONICET, RA-5500 Mendoza, Argentina

[3] Univ Nacl Cuyo, Inst Ciencias Basicas, RA-5500 Mendoza, Argentina

[4] Louisiana State Univ, Cain Dept Chem Engn, Baton Rouge, LA 70803 USA

[5] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[6] Virginia Tech, Dept Mat Sci, Blacksburg, VA 24061 USA

来源：

NANO LETTERS | 2012年 / 12卷 / 07期

关键词：

Radiation damage; nanofoams; gold; computer simulations; CASCADES; METALS; DAMAGE; NI;

D O I：

10.1021/nl201383u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The key to perfect radiation endurance is perfect recovery. Since surfaces are perfect sinks for defects, a porous material with a high surface to volume ratio has the potential to be extremely radiation tolerant, provided it is morphologically stable in a radiation environment. Experiments and computer simulations on nanoscale gold foams reported here show the existence of a window in the parameter space where foams are radiation tolerant. We analyze these results in terms of a model for the irradiation response that quantitatively locates such window that appears to be the consequence of the combined effect of two length scales dependent on the irradiation conditions: (i) foams with ligament diameters below a minimum value display ligament melting and breaking, together with compaction increasing with dose (this value is typically similar to 5 nm for primary knock on atoms (PKA) of similar to 15 keV in Au), while (ii) foams with ligament diameters above a maximum value show bulk behavior, that is, damage accumulation (few hundred nanometers for the PKA's energy and dose rate used in this study). In between these dimensions, (i.e., similar to 100 nm in Au), defect migration to the ligament surface happens faster than the time between cascades, ensuring radiation resistance for a given dose-rate. We conclude that foams can be tailored to become radiation tolerant.

引用

页码：3351 / 3355

页数：5

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