Details
| Original language | English |
|---|---|
| Pages (from-to) | 15263–15273 |
| Number of pages | 11 |
| Journal | The Journal of Physical Chemistry C |
| Volume | 126 |
| Issue number | 36 |
| Early online date | 1 Sept 2022 |
| Publication status | Published - 15 Sept 2022 |
Abstract
Due to their unique optical properties, nanoparticles are well suited for heating by laser irradiation. In this context, colloidally dispersed particles are of particular interest because in conventional ways of heating, the maximum attainable temperature is limited by the boiling point of the solvent. With the right choice of the used laser wavelength, it is possible to selectively heat these particles above the melting point of the material whereas the surrounding and laser-transparent medium remains comparatively cold. This type of laser process is called laser melting in liquids (LML). To further investigate the possibilities of laser-induced heating processes, colloidally dispersed copper(II) oxide (CuO) nanoparticles were synthesized, dispersed in ethanol, and irradiated with a nanosecond-pulsed Nd:YAG laser. In this way, a laser-induced phase transition into the copper richer copper(I) oxide (Cu2O) phase and into elemental copper can be observed. The conversion process is followed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), selected area electron diffraction (SAED), and UV-vis spectroscopy. It is shown that in the initial LML process a minimum particle size of 23-29 nm is required for a successful phase transition likely due to the size dependent heating efficiency, cooling effects, and the formation of nanobubbles.
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In: The Journal of Physical Chemistry C, Vol. 126, No. 36, 15.09.2022, p. 15263–15273.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Size-Dependent Threshold of the Laser-Induced Phase Transition of Colloidally Dispersed Copper Oxide Nanoparticles
AU - Kranz, Daniel
AU - Bessel, Patrick
AU - Niemeyer, Max
AU - Borg, Hadir
AU - Rosebrock, Marina
AU - Himstedt, Rasmus
AU - Bigall, Nadja C.
AU - Dorfs, Dirk
N1 - Funding Information: N.C.B. and D.D. are grateful for funding by the German Research Foundation (DFG) under Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC2122). D.K. thanks the Konrad-Adenauer-Stiftung (KAS) for the financial support. P.B. and R.H. are grateful for funding by the Hannover School of Nanotechnology (HSN). M.N. and D.D. acknowledge financial support by the German Research Foundation (DFG) Research Grant 1580/5-1. H.B., M.R., and N.C.B. thank the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Program (Grant Agreement 714429) for funding. The authors thank the Laboratory of Nano and Quantum Engineering (LNQE) for the use of the TEM and apl. Prof. Armin Feldhoff for the use of the XRD.
PY - 2022/9/15
Y1 - 2022/9/15
N2 - Due to their unique optical properties, nanoparticles are well suited for heating by laser irradiation. In this context, colloidally dispersed particles are of particular interest because in conventional ways of heating, the maximum attainable temperature is limited by the boiling point of the solvent. With the right choice of the used laser wavelength, it is possible to selectively heat these particles above the melting point of the material whereas the surrounding and laser-transparent medium remains comparatively cold. This type of laser process is called laser melting in liquids (LML). To further investigate the possibilities of laser-induced heating processes, colloidally dispersed copper(II) oxide (CuO) nanoparticles were synthesized, dispersed in ethanol, and irradiated with a nanosecond-pulsed Nd:YAG laser. In this way, a laser-induced phase transition into the copper richer copper(I) oxide (Cu2O) phase and into elemental copper can be observed. The conversion process is followed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), selected area electron diffraction (SAED), and UV-vis spectroscopy. It is shown that in the initial LML process a minimum particle size of 23-29 nm is required for a successful phase transition likely due to the size dependent heating efficiency, cooling effects, and the formation of nanobubbles.
AB - Due to their unique optical properties, nanoparticles are well suited for heating by laser irradiation. In this context, colloidally dispersed particles are of particular interest because in conventional ways of heating, the maximum attainable temperature is limited by the boiling point of the solvent. With the right choice of the used laser wavelength, it is possible to selectively heat these particles above the melting point of the material whereas the surrounding and laser-transparent medium remains comparatively cold. This type of laser process is called laser melting in liquids (LML). To further investigate the possibilities of laser-induced heating processes, colloidally dispersed copper(II) oxide (CuO) nanoparticles were synthesized, dispersed in ethanol, and irradiated with a nanosecond-pulsed Nd:YAG laser. In this way, a laser-induced phase transition into the copper richer copper(I) oxide (Cu2O) phase and into elemental copper can be observed. The conversion process is followed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), selected area electron diffraction (SAED), and UV-vis spectroscopy. It is shown that in the initial LML process a minimum particle size of 23-29 nm is required for a successful phase transition likely due to the size dependent heating efficiency, cooling effects, and the formation of nanobubbles.
UR - http://www.scopus.com/inward/record.url?scp=85137897239&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.2c03815
DO - 10.1021/acs.jpcc.2c03815
M3 - Article
VL - 126
SP - 15263
EP - 15273
JO - The Journal of Physical Chemistry C
JF - The Journal of Physical Chemistry C
IS - 36
ER -