期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 49, 页码 55195-55204出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c17897
关键词
thermometry; bismuth silicates; glass-ceramic nanoparticles; neodymium; spectroscopy
资金
- CATHENA project - FVG Region POR-FESR 2014-2020 program [CUP: J34I17000010006]
- JSPS [16H06441, 19H02798]
- Joint Studies Program of the Institute for Molecular Science [30-822]
- [17F17761]
- Grants-in-Aid for Scientific Research [19H02798] Funding Source: KAKEN
Bismuth-based (nano)materials have been attracting increasing interest due to appealing properties such as high refractive indexes, intrinsic opacity, and structural distortions due to the stereochemistry of 6s(2) lone pair electrons of Bi3+. However, the control over specific phases and strategies able to stabilize uniform bismuth-based (nano)materials is still a challenge. In this study, we employed the ability of bismuth to lower the melting point of silica to introduce a new synthetic approach able to confine the growth of bismuth-oxide-based materials into nanostructures. Combining in situ temperature-dependent synchrotron radiation X-ray powder diffraction (XRPD) with high-resolution transmission electron microscopy (HR-TEM) analyses, we demonstrate the evolution of a confined Bi2O3-SiO2 nanosystem from Bi2SiO3 to Bi4Si3O12 through a melting process. The silica shell acts as both a nanoreactor and a silicon source for the stabilization of bismuth silicate glass-ceramic nanocrystals keeping the original spherical shape. The exciton peak of Bi2SiO s is measured for the first time allowing the estimation of its real energy gap. Moreover, based on a detailed spectroscopic investigation, we discuss the potential and the limitations of Nd3+-activated bismuth silicate systems as ratiometric thermometers. The synthetic strategy introduced here could be further explored to stabilize other bismuth-oxide-based materials, opening the way toward the growth of well-defined glass-ceramic nanoparticles.
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