Thermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopy

被引：10

作者：

Li, Bochao ^{[1
]}

Yang, Chang ^{[1
]}

Li, Hao ^{[1
]}

Ji, Boyu ^{[1
]}

Lin, Jingquan ^{[1
]}

Tomie, Toshihisa ^{[1
,2
]}

机构：

[1] Changchun Univ Sci & Technol, Sch Sci, 7089 Weixing Rd, Changchun 13022, Jilin, Peoples R China

[2] Natl Inst Adv Ind Sci & Technol, Nanoelect Res Inst, Cent 2,1-1-1 Umezono, Tsukuba, Ibaraki 3058562, Japan

来源：

AIP ADVANCES | 2019年 / 9卷 / 02期

基金：

中国国家自然科学基金;

关键词：

MULTIPHOTON PHOTOEMISSION; CO OXIDATION; SURFACES; RELAXATION; DYNAMICS;

D O I：

10.1063/1.5082772

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study reports that thermionic emission can dominate over multi-photon ionization in gold nanoparticles under femtosecond laser irradiation. The brightness of individual particles observed with photoemission electron microscopy increased steeply for laser power above 200 mW, which is reproduced well by the Richardson-Dushman equation. The temperature estimated by fitting the equation is about 1 eV. This high temperature suggests that the laser is absorbed by defects. The difference in brightness among the nanoparticles as large as a few orders of magnitude is attributed to variation in the defect density. The particles having a similar temperature despite exhibiting largely varying brightness levels can be explained by slow energy transfer from the defects to the ambient electron gas. Discussions for interpreting the observed results suggest that thermionic emission can be a useful diagnostic tool for characterizing nanoparticles. (C) 2019 Author(s).

引用

页数：8

共 32 条

[21] Evaluation of the Au size effect:: CO oxidation catalyzed by Au/TiO2 [J].

Overbury, S. H. ;

Schwartz, Viviane ;

Mullim, David R. ;

Yan, Wenfu ;

Dai, Sheng .

JOURNAL OF CATALYSIS, 2006, 241 (01) :56-65

[22] Lifetime difference of photoexcited electrons between intraband and interband transitions [J].

Pawlik, S ;

Bauer, M ;

Aeschlimann, M .

SURFACE SCIENCE, 1997, 377 (1-3) :206-209

[23] Femtosecond time-resolved two-photon photoemission studies of electron dynamics in metals [J].

Petek, H ;

Ogawa, S .

PROGRESS IN SURFACE SCIENCE, 1997, 56 (04) :239-310

[24]

Schenk M., 2005, PHYS REV LETT, V94

[25] Time-resolved two photon photoemission electron microscopy [J].

Schmidt, O ;

Bauer, M ;

Wiemann, C ;

Porath, R ;

Scharte, M ;

Andreyev, O ;

Schönhense, G ;

Aeschlimann, M .

APPLIED PHYSICS B-LASERS AND OPTICS, 2002, 74 (03) :223-227

[26] The spatial distribution of non-linear effects in multi-photon photoemission from metallic adsorbates on Si(111) [J].

Schmidt, O ;

Fecher, GH ;

Hwu, Y ;

Schönhense, G .

SURFACE SCIENCE, 2001, 482 :687-692

[27]

Schwank J., 1983, GOLD BULL, V18, P103, DOI [10.1007/BF03214632, DOI 10.1007/BF03214632]

[28] Drastic reduction of plasmon damping in gold nanorods -: art. no. 077402 [J].

Sönnichsen, C ;

Franzl, T ;

Wilk, T ;

von Plessen, G ;

Feldmann, J ;

Wilson, O ;

Mulvaney, P .

PHYSICAL REVIEW LETTERS, 2002, 88 (07) :774021-774024

[29] Hot-Electron Transfer from Semiconductor Nanocrystals [J].

Tisdale, William A. ;

Williams, Kenrick J. ;

Timp, Brooke A. ;

Norris, David J. ;

Aydil, Eray S. ;

Zhu, X. -Y. .

SCIENCE, 2010, 328 (5985) :1543-1547

[30] Local 2PPE-yield enhancement in a defined periodic silver nanodisk array [J].

Wiemann, C. ;

Bayer, D. ;

Rohmer, M. ;

Aeschlimann, M. ;

Bauer, M. .

SURFACE SCIENCE, 2007, 601 (20) :4714-4721

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