EPr study of copper(I) sulphide

Walczak, J.; Dębiński, H.; Muraszko, B.; Kuriata, J.; Sadlowski, L.

doi:10.1002/pssa.2210970128

Cited by 5 publications

(2 citation statements)

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“…The Cu vacancies can be the result of migration and oxidation of the Cu + to Cu 2+ , which could be detected by EPR measurements. A previous report on bulk copper sulfide has published a g -factor in the range of g = 2.09–2.61, depending on the stoichiometry and crystal phase of the copper sulfide crystal . In Figure a, the EPR spectra of untreated, hydrazine- and EDT-treated, and annealed Cu 2– x S NCs are shown.…”

Section: Experimental Datamentioning

confidence: 92%

“…A previous report on bulk copper sulfide has published a g-factor in the range of g = 2.09−2.61, depending on the stoichiometry and crystal phase of the copper sulfide crystal. 49 In Figure 6a, the EPR spectra of untreated, hydrazineand EDT-treated, and annealed Cu 2−x S NCs are shown. For all samples, we find an isotropic signal with a g-factor of g = 2.0036 ± 0.0005.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Electronic Changes Induced by Surface Modification of Cu_2–xS Nanocrystals

et al. 2015

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Copper sulfide nanocrystals (Cu 2−x S NCs) consisting of earth-abundant and nontoxic elements have attracted attention for optoelectronic and plasmonic applications due to their tunable light absorption and emission properties. In this work, we present a study of the electronic changes induced in organic-capped Cu 2−x S NCs by surface modification treatments using charge transport and optical spectroscopy measurements. We have investigated surface treatments yielding ligand exchange and also ligand removal as well as changes in electronic defect density. The structural and morphological changes induced by the treatments were monitored by infrared spectroscopy, electron microscopy, and electron paramagnetic resonance. Untreated Cu 2−x S NCs exhibit a strong absorption band arising from a localized surface plasmon resonance (LSPR). We found that using a ligand exchange procedure (ethanedithiol treatment), the electrical conductivity in films of Cu 2−x S NCs can be enhanced by 5 orders of magnitude, while maintaining other electronic properties of the individual NCs like optical absorption and LSPR. The improvements in the electrical conductivity were attributed to the reduction of the inter-NC separation in the films, as revealed by the structural and morphological studies. We also have observed that ligand removal treatments such as thermal annealing and hydrazine treatment yield a LSPR red-shift, while the electrical conductivity increases by up to 5 and 7 orders of magnitude, respectively. We proposed a model for the surface reactions taking place during these treatments. Our work highlights the potential of simple chemical or thermal treatments in tailoring the electronic properties of Cu 2−x S NCs, making thermally treated Cu 2−x S NCs interesting for tunable plasmonic and optoelectronic applications.

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Section: Experimental Datamentioning

confidence: 92%

Section: ■ Experimental Sectionmentioning

confidence: 99%