| 1 | Yoctonewton force detection based on optically levitated oscillator显示文摘Optically levitated oscillators in high vacuum have excellent environmental isolation and low mass compared with conventional solid-state sensors,which makes them suitable for ultrasensitive force detection.The force resolution usually scales with the measurement bandwidth,which represents the ultimate detection capability of the system under ideal conditions if sufficient time is provided for measurement.However,considering the stability of a real system,a method based on the Allan variance is more reliable to evaluate the actual force detection performance.In this study,a levitated optomechanical system with a force detection sensitivity of 6.33±1.62 zN/Hz^(1/2)was demonstrated.And for the first time,the Allan variance was introduced to evaluate the system stability due to the force sensitivity fluctuations.The force detection resolution of 166.40±55.48 yN was reached at the optimal measurement time of 2751 s.The system demonstrated in this work has the best force detection performance in both sensitivity and resolution that have been reported so far for optically levitated particles.The reported high-sensitivity force detection system is an excellent candidate for the exploration of new physics such as fifth force searching,high-frequency gravitational waves detection,dark matter research and so on. | Tao Liang Shaochong Zhu Peitong He Zhiming Chen Yingying Wang Cuihong Li Zhenhai Fu Xiaowen Gao Xinfan Chen Nan Li Qi Zhu Huizhu Hu | 2023 | Fundamental Research2023，3，1： | 1 |
| 2 | In situ preparation of g-C_(3)N_(4)/polyaniline hybrid composites with enhanced visible-light photocatalytic performance显示文摘The graphic carbon nitride/polyaniline(g-C_(3)N_(4)/PANI)hybrid composites were successfully synthesized by a facile in situ polymerization process under ice water bath.The photocatalytic activities of the g-C_(3)N_(4)/PANI composites were evaluated by using oxytetracycline(OTC)as model pollutants.The optimal g-C_(3)N_(4)/PANI composite(5%PANI:the g-C_(3)N_(4)/PANI hybrid with 5 wt.%of PANI)showed an enhancement degradation rate of 5-fold compared to that of conventional g-C_(3)N_(4)under simulated-sunlight irradiation.In addition,the 5%PANI demonstrate significantly photocatalytic evolution H_(2)rate(163.2μmol/(g·hr))under the visible light irradiation.Furthermore,based on the results of optical performance and electrochemical testing,a possible mechanism was proposed,indicating that the incorporation of PANI into the traditional g-C_(3)N_(4)can effectively tune the electronic structures,improve the photo-generated electrons-holes separation and enhance extensive absorption of visible light.Such a g-C_(3)N_(4)/PANI hybrid nanocomposites could be envisaged to possess great potentials in practical wastewater treatment and water splitting. | Chongfei Yu Lu Tan Shujie Shen Menghao Fang Ling Yang Xinfan Fu Shuying Dong Jianhui Sun | 2021 | Journal of Environmental Sciences2021，33，6： | 1 |
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