Photoactivated CdSe nanocrystals as nanosensors for gases

被引：241

作者：

Nazzal, AY

Qu, LH

Peng, XG

Xiao, M ^{[1
]}

机构：

[1] Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA

[2] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

来源：

NANO LETTERS | 2003年 / 3卷 / 06期

关键词：

D O I：

10.1021/nl0340935

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The photoluminescence (PL) of high-quality CdSe nanocrystals (NCs) incorporated into polymer thin films was found to respond reversibly and rapidly to environmental changes upon photoradiation above their absorption onset. The PL of the NCs may be dramatically enhanced or diminished depending on the properties of the gases. Photostimulation was found to be necessary for the response, which likely makes the original dense-ligands monolayer on the surface of the NCs permeable to gases by the activation of the vibration modes of the NC lattice through photon-phonon coupling.

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页码：819 / 822

页数：4

相关论文

共 17 条

[1] Semiconductor clusters, nanocrystals, and quantum dots [J].

Alivisatos, AP .

SCIENCE, 1996, 271 (5251) :933-937

[2]

[Anonymous], 1999, ACC CHEM RES, P32

[3] Surface effects on regularities of electron transfer in CdS and CdS/Cu2S colloids as studied by photoluminescence quenching [J].

Bavykin, DV ;

Savinov, EN ;

Parmon, VN .

LANGMUIR, 1999, 15 (14) :4722-4727

[4] Polarization spectroscopy of single CdSe quantum rods [J].

Chen, X ;

Nazzal, A ;

Goorskey, D ;

Xiao, M ;

Peng, ZA ;

Peng, XG .

PHYSICAL REVIEW B, 2001, 64 (24) :2453041-2453044

[5] Nanowire nanosensors for highly sensitive and selective detection of biological and chemical species [J].

Cui, Y ;

Wei, QQ ;

Park, HK ;

Lieber, CM .

SCIENCE, 2001, 293 (5533) :1289-1292

[6] PHOTOPHYSICS OF QUANTIZED COLLOIDAL SEMICONDUCTORS DRAMATIC LUMINESCENCE ENHANCEMENT BY BINDING OF SIMPLE AMINES [J].

DANNHAUSER, T ;

ONEIL, M ;

JOHANSSON, K ;

WHITTEN, D ;

MCLENDON, G .

JOURNAL OF PHYSICAL CHEMISTRY, 1986, 90 (23) :6074-6076

[7]

Empedocles SA, 1999, ADV MATER, V11, P1243, DOI 10.1002/(SICI)1521-4095(199910)11:15<1243::AID-ADMA1243>3.0.CO

[8]

2-2

[9] Surface transformation and photoinduced recovery in CdSe nanocrystals [J].

Hess, BC ;

Okhrimenko, IG ;

Davis, RC ;

Stevens, BC ;

Schulzke, QA ;

Wright, KC ;

Bass, CD ;

Evans, CD ;

Summers, SL .

PHYSICAL REVIEW LETTERS, 2001, 86 (14) :3132-3135

[10] CDS-PARTICLE-MEDIATED TRANSMEMBRANE PHOTOELECTRON TRANSFER IN SURFACTANT VESICLES [J].

HORVATH, O ;

FENDLER, JH .

JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (24) :9591-9594