Smart luminescent materials, which can respond to the changing of external environment (light, electricity, force, temperature, etc.), have always been one of the research hotspots. Mechanochromism refers to the materials whose emission color or intensity can be altered under the stimulation of external mechanical force. This kind of smart materials have been widely used in data storage, information encryption and sensors due to its simple operation, obvious and rapid response. The introduction of metal atoms in metal-organic compounds brings about fascinating metalophilic interactions and results in more interesting and surprising mechanochromic behaviors. In this mini-review, recent advances in mechanochromism of metal-organic compounds, including mono-, di-, multinuclear metal-organic complexes and metallic clusters are summarized. Varies mechanisms are discussed and some design strategies for metal-organic compounds with mechanochromism are also presented.
Introducing
small metallic atoms is an effective approach to enhance
thermoelectric performance. In this research, we investigate the impacts
of Ni and Zn on the thermoelectric performance of n-type PbS. We find
that adding Ni is superior to that of Zn. Both experimental and theoretical
results show that the extra Ni could bring a new impurity level among
the Fermi energy, thus the electrons can be easily excited from defect
states, leading to enhanced carrier mobility. Above all, adding Ni
can boost the thermoelectric performance of n-type PbS dramatically.
A peak ZT value at 823 K and a ZT
ave value of Pb0.995In0.005S + 5%
Ni were achieved as ∼1.0 and ∼0.66, respectively.
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