Probing the surface of transition-metal nanocrystals by chemiluminesence

Galyna Krylova; Nada M. Dimitrijevic; Dmitri V. Talapin; Jeffrey R. Guest; Holger Borchert; Arun Lobo; Tijana Rajh; Elena V. Shevchenko

doi:10.1021/ja102413k

Probing the surface of transition-metal nanocrystals by chemiluminesence

Galyna Krylova, Nada M. Dimitrijevic, Dmitri V. Talapin, Jeffrey R. Guest, Holger Borchert, Arun Lobo, Tijana Rajh, Elena V. Shevchenko

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

We propose a simple chemiluminescence (CL) method for investigation of the surface of Co-based nanocrystals (NCs). Using a combination of CL and spin-trap electron paramagnetic resonance techniques, we systematically studied the generation of reactive oxygen species (ROS) at the surface of differently sized CoPt₃ spherical NCs and CoPt₃/Au nanodumbbells. We have shown that differently sized CoPt₃ NCs can promote the formation of ROS and as a result can lead to the oxidation of luminol accompanied by the emission of the light. CL allows monitoring the stability of transition-metal-based NCs against oxidation and dissolution. We found by CL that cobalt ions slowly leach from the surface of CoPt₃ NCs even under very mild conditions; however, the amount of the leached cobalt ions does not exceed the maximal concentration of cobalt at the NC surface indicating that only surface atoms can go into solution.

Original language	English (US)
Pages (from-to)	9102-9110
Number of pages	9
Journal	Journal of the American Chemical Society
Volume	132
Issue number	26
DOIs	https://doi.org/10.1021/ja102413k
State	Published - Jul 7 2010
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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10.1021/ja102413k

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title = "Probing the surface of transition-metal nanocrystals by chemiluminesence",

abstract = "We propose a simple chemiluminescence (CL) method for investigation of the surface of Co-based nanocrystals (NCs). Using a combination of CL and spin-trap electron paramagnetic resonance techniques, we systematically studied the generation of reactive oxygen species (ROS) at the surface of differently sized CoPt3 spherical NCs and CoPt3/Au nanodumbbells. We have shown that differently sized CoPt3 NCs can promote the formation of ROS and as a result can lead to the oxidation of luminol accompanied by the emission of the light. CL allows monitoring the stability of transition-metal-based NCs against oxidation and dissolution. We found by CL that cobalt ions slowly leach from the surface of CoPt3 NCs even under very mild conditions; however, the amount of the leached cobalt ions does not exceed the maximal concentration of cobalt at the NC surface indicating that only surface atoms can go into solution.",

author = "Galyna Krylova and Dimitrijevic, {Nada M.} and Talapin, {Dmitri V.} and Guest, {Jeffrey R.} and Holger Borchert and Arun Lobo and Tijana Rajh and Shevchenko, {Elena V.}",

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T1 - Probing the surface of transition-metal nanocrystals by chemiluminesence

AU - Krylova, Galyna

AU - Dimitrijevic, Nada M.

AU - Talapin, Dmitri V.

AU - Guest, Jeffrey R.

AU - Borchert, Holger

AU - Lobo, Arun

AU - Rajh, Tijana

AU - Shevchenko, Elena V.

PY - 2010/7/7

Y1 - 2010/7/7

N2 - We propose a simple chemiluminescence (CL) method for investigation of the surface of Co-based nanocrystals (NCs). Using a combination of CL and spin-trap electron paramagnetic resonance techniques, we systematically studied the generation of reactive oxygen species (ROS) at the surface of differently sized CoPt3 spherical NCs and CoPt3/Au nanodumbbells. We have shown that differently sized CoPt3 NCs can promote the formation of ROS and as a result can lead to the oxidation of luminol accompanied by the emission of the light. CL allows monitoring the stability of transition-metal-based NCs against oxidation and dissolution. We found by CL that cobalt ions slowly leach from the surface of CoPt3 NCs even under very mild conditions; however, the amount of the leached cobalt ions does not exceed the maximal concentration of cobalt at the NC surface indicating that only surface atoms can go into solution.

AB - We propose a simple chemiluminescence (CL) method for investigation of the surface of Co-based nanocrystals (NCs). Using a combination of CL and spin-trap electron paramagnetic resonance techniques, we systematically studied the generation of reactive oxygen species (ROS) at the surface of differently sized CoPt3 spherical NCs and CoPt3/Au nanodumbbells. We have shown that differently sized CoPt3 NCs can promote the formation of ROS and as a result can lead to the oxidation of luminol accompanied by the emission of the light. CL allows monitoring the stability of transition-metal-based NCs against oxidation and dissolution. We found by CL that cobalt ions slowly leach from the surface of CoPt3 NCs even under very mild conditions; however, the amount of the leached cobalt ions does not exceed the maximal concentration of cobalt at the NC surface indicating that only surface atoms can go into solution.

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Probing the surface of transition-metal nanocrystals by chemiluminesence

Abstract

ASJC Scopus subject areas

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