Synthesis, characterization and testing of Cr(III)‐doped aluminum oxide/molybdate nanocomposites as luminescent probes for scanning thermal microscopy. Issue 12 (26th October 2015)

• Record Type: Journal Article
• Authors: Hizhnyi, Yu.; Nedilko, S.; Chornii, V.; Terebilenko, K.; Slobodyanik, N.; Aigouy, L.
• Is Part Of: Physica status solidi. Volume 12:Issue 12(2015:Dec.)
• Page Start: 1306
• Page End: 1312
• Publication Date: 2015-10-26
• Subjects: fluorescence -- nanocomposite -- near‐field optics -- aluminum oxide -- molybdate; Solid state physics -- Congresses; Solid state physics -- Periodicals; Solid state physics; Conference proceedings; Periodicals; 530.41
• DOI: 10.1002/pssc.201510148
• Languages: English
• ISSNs: 1862-6351

Abstract

Abstract: The conditions of synthesis and luminescence characteristics of composites Al2 O3 :Cr 3+ /NaAl(MoO4 )2 :Cr 3+ obtained from molybdate high‐temperature solutions have been studied. The composite formation has been achieved by rapid cooling of a Na‐Al‐Cr‐Mo‐O molten solution in the range of 1173‐820 K. The sizes of the alumina inclusions in the molybdate host range from sub‐microns to tenth of microns. The composite material is transparent for light in the visible spectral region, it allows effective excitation of the Cr 3+ luminescence in Cr 3+ ‐ related absorption bands in both NaAl(MoO4 )2 hosts and Al2 O3 inclusions. At liquid helium temperature, the Al2 O3 :Cr 3+ /NaAl(MoO4 )2 :Cr 3+ composite materials simultaneously reveal luminescence of Cr 3+ ions in NaAl(MoO4 )2 (the R‐line near 741 nm) and in Al2 O3 (the R1 line near 693 nm). At room temperature, the Al2 O3 :Cr 3+ inclusions reveal Cr 3+ ‐related R1 and R2 lines at 694.2 and 692.8 nm, respectively, whereas the luminescence of Cr 3+ ions in the molybdate host is quenched. Testing of Al2 O3 :Cr 3+ fluorescent particles in a scanning thermal microscope reveals potential of using the Cr‐doped Al2 O3 :Cr/NaAl(MoO4 )2 nanocomposites for high‐resolution mapping of the surface temperature in 300‐380 K temperature range. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)