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| Attractively, it can be restored to its original fluorescence through either thermal annealing at 80°C for 5 min or solvent fuming with DCM. The pressure dependent emission of DMCS-TPA was further examined. A progressive change of the shape and position of fluorescence spectra with increased pressure from 2 MPa to 10 MPa was observed. As shown in Fig. 5b, application of 2 MPa induces a slight widening on the tail with little change of maximum PL wavelength. The powder pressed at 5 MPa exhibits a red shifted fluorescence at 544 nm. Adoption of 10 MPa causes a noticeable emission change by 74 nm from yellowish green to orange. The wide coverage of emissive spectra under a small load of pressure reveals the sensitive feature of DMCS-TPA towards mechanical stimuli. Whereas the sample subjected to 10 MPa is not stable at room temperature, showing a partial recovery within seconds. The mechano-chromism can be recycled many times with almost no deterio-ration, indicating its reversibility and durability. |
值得注意的是,它可通過在80°C下熱處理5分鐘或者用DCM進行溶劑熏蒸使其恢復原有的熒光特性。DMCS-TPA的噴射氣壓還有待進一步的測定。當壓力由2MPa升至10MPa時可觀察到熒光光譜的形狀及位置有明顯變化。如表5b所示,當壓力為2MPa時,會引起PL波有輕微的拓寬,而波長的峰值幾乎不變。在5MPa下壓制的粉末于544nm處出現(xiàn)紅色熒光。 后面自己看看吧,不像老外寫的,有些地方有點別扭。 |
至尊木蟲 (知名作家)
Translator and Proofreader
| 很有吸引力的是,可以通過在80℃熱退火5分鐘或者用DCM進行溶劑發(fā)煙恢復其原始熒光。進一步研究了DMCS-TPA的壓力依賴性發(fā)光作用。發(fā)現(xiàn)隨著壓力的增加,從2MPa至10MPa, 熒光光譜形狀和位置逐步改變。如圖5b所示,施加2MPa時引起的最大PL波長變化不大,尾部略有拓寬。當用5MPa施壓粉劑時,熒光則紅移至544nm。采用10MPa時引起74納米的發(fā)光改變,由黃綠色轉變?yōu)槌壬。在小負荷的壓力下所呈現(xiàn)的較廣的發(fā)光光譜證明了DMCS-TPA對機械刺激敏感的特性。但是經(jīng)受10MPa的樣品在室溫下不穩(wěn)定,在數(shù)秒內就可以部分恢復。可多次循環(huán)使用機械性致變色,幾乎沒有弱化,表明其可逆性和耐久性。 |
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