Figure 4 - uploaded by Alexey Kucherik
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PL spectra of the deposited polyyne chains of different lengths (the number of atoms in the chain is indicated on the top of the corresponding spectral resonance): (a) shows the spectra taken at temperatures from 90 to 50K (red curve corresponds to 90 K, yellow curve corresponds to 80K, green curve corresponds to 70K, teal curve corresponds to 60K, blue curve corresponds to 50K). The laser excitation wavelength is 390 nm with the intensity of 5 mW and the acquisition time of 10 s. (b) shows the PL spectra taken at 4K. Red, blue and black curves correspond to the excitation wavelengths of 390, 380 and 370 nm, respectively. The acquisition time is 40 s.
Source publication
We synthesise and deposit on a substrate monoatomic chains of carbon atoms stabilised by gold nanoparticles. Raman, absorption and photoluminescence (PL) spectra reveal resonant features of straight polyyne chains, that is significantly beyond the theoretical stability limit of 6 atoms for free-standing carbon chains. Polyyne is a direct band gap s...
Contexts in source publication
Context 1
... chains containing from 8 to 18 atoms (24) typically dominate the spectra. Figure 4(a) shows the characteristic PL spectra featuring broad resonances corresponding to the chains of different lengths emitting in the spectral range from 2.4 to 3.0 eV. The lowest energy optical transition shifts to the red with the increase of the length of the chain, in full agreement with the theoretical predictions (24). ...
Context 2
... lowest energy optical transition shifts to the red with the increase of the length of the chain, in full agreement with the theoretical predictions (24). As the temperature goes down to 4K, a very distinct and peculiar fine structure emerges on the top of each broad PL peak (Figure 4(b)). Nearly identical triplet structures are observed for the chains of 10, 12, 14, 16 atoms. ...
Context 3
... optical excitation we employ in these experiments is tightly focused onto a sample by Mitutoyo M Plan APO SL x50 microscope objective with a numerical aperture of 0.42. Note that we use three different excitation wavelengths to elucidate the nature of the observed fine lines in the PL spectra, namely 390, 380 and 370 nm as shown in Figure 4. We collect PL signal in the transmission configuration using the same Mitutoyo M Plan APO SL x50 microscope objective. ...
Context 4
... chains containing from 8 to 18 atoms (24) typically dominate the spectra. Figure 4(a) shows the characteristic PL spectra featuring broad resonances corresponding to the chains of different lengths emitting in the spectral range from 2.4 to 3.0 eV. The lowest energy optical transition shifts to the red with the increase of the length of the chain, in full agreement with the theoretical predictions (24). ...
Context 5
... lowest energy optical transition shifts to the red with the increase of the length of the chain, in full agreement with the theoretical predictions (24). As the temperature goes down to 4K, a very distinct and peculiar fine structure emerges on the top of each broad PL peak (Figure 4(b)). Nearly identical triplet structures are observed for the chains of 10, 12, 14, 16 atoms. ...
Context 6
... optical excitation we employ in these experiments is tightly focused onto a sample by Mitutoyo M Plan APO SL x50 microscope objective with a numerical aperture of 0.42. Note that we use three different excitation wavelengths to elucidate the nature of the observed fine lines in the PL spectra, namely 390, 380 and 370 nm as shown in Figure 4. We collect PL signal in the transmission configuration using the same Mitutoyo M Plan APO SL x50 microscope objective. ...
