Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 16
·2714-2721
·
IF 5.047
Chao Xu,Ying Qian
A simple selenamorpholine-based fluorescent probe has been designed and synthesized using a combination of selenamorpholine and a BODIPY fluorophore. BODIPY–Se has a low pKa value of 4.78 because of the selenamorpholine unit, which is beneficial for the probe to detect the lysosome. BODIPY–Se can turn on partial fluorescence only in lysosomes, due to a PET-inhibited process of protonation of selenamorpholine. In addition, the selenamorpholine unit of BODIPY–Se could selectively react with H2O2 through a redox reaction, leading to the alteration of the valence state of selenium from Se(II) to Se(IV) and an additional PET-inhibited process. When BODIPY–Se tracked H2O2 in lysosomes, the two PET-inhibited processes would obviously amplify the fluorescence signal in living cells and in vivo. The probe could also detect the redox cycles between H2O2 and GSH continuously. Using confocal fluorescence imaging, the fluorescence localization of lysosomes demonstrated that BODIPY–Se could successfully target lysosomes. The probe could not only detect exogenous/endogenous H2O2 in living cells, but could also realize real-time monitoring of H2O2 in cancer cells and zebrafish. The results proved that BODIPY–Se is a promising fluorescent probe in biological applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 3
·393
·
IF 4.034
Weili Li,Hongchao Geng,Lu Yao,Kesheng Cao,Pengtao Sheng,Qingyun Cai
Here we present the photoelectrocatalytic hydrogen generation properties of CdS passivated ZnCuInSe (ZCISe) quantum dots (QDs) supported by TiO2nanowires decorated with Ag nanoparticles. In this configuration, Ag nanoparticles were sandwiched between the photo-electrons collector (TiO2) and photo-sensitizers (ZCISe), and acted as an electron relay speeding up the charge carrier transport. ZCISe and CdS enabled the optical absorption of the photoelectrode ranging from ultraviolet to near infrared region, which significantly enhanced the solar-to-chemical energy conversion efficiency. A photocurrent of 10.5 mA/cm2and a hydrogen production rate of about 52.9 μmol/h were achieved under simulated sunlight (1.5 AG).Keywords:ZCISe QDs;TiO2nanowires;photocatalytic;hydrogen generation
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 19
·9327-9334
·
IF 6.97
Xiongbin Wang,Junjie Hao,Jiaji Cheng,Junzi Li,Jun Miao,Ruxue Li,Yiwen Li,Jiagen Li,Yuhui Liu,Xi Zhu,Yanjun Liu,Xiao Wei Sun,Zikang Tang,Marie-Hélène Delville,Tingchao He,Rui Chen
As opposed to traditional photoluminescence and ultra-violet based optical sensing, we present here a sensing system based on resolved optically active polarization with promising applications. It is based on the ultrathin CdSe nanoplatelets (NPLs) when modified with either L or D-cysteine molecules (L/D-cys) as bio-to-nano ligands. The chiral ligand transfers its chiroptical activity to the achiral nanoplatelets with an anisotropy factor of ∼10−4, which unlocks the chiral excitonic transitions and allows lead ion detection with a limit of detection (LOD) as low as 4.9 nM. Simulations and modelling based on time-dependent density functional theory (TD-DFT) reveal the chiral mechanism of L/D-cys capped CdSe NPLs. The presented CD-based sensing system illustrates an alternative possibility of using chiral CdSe NPLs as competitive chiral sensors for heavy metal ion detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Nanomaterials
·
2019
·
IF 2.233
Tingting Zhang,Xugu Zhang,Peizhi Yang,Jinke Bai,Chun Chang,Xiao Jin,Feng Zhao,Yan Huang,Feng Li
Stable luminance properties are essential for light-emitting devices with excellent performance. Thermal photoluminescence (PL) quenching of quantum dots (QDs) under a high temperature resulting from a surface hole or electron traps will lead to unstable and dim brightness. After treating CdZnSe/ZnSe QDs with TBP, which is a well-known passivation reagent of the anions, the excess Se sites on the surface of the QDs were removed and their PL quantum yields (QYs) was improved remarkable. Furthermore, after TBP treatment, the CdZnSe/ZnSe QDs exhibit no quenching phenomena even at a high temperature of 310°C. The electroluminescent light-mitting diodes based on the QDs with TBP treatment also demonstrated satisfied performance with a maximum current density of 1679.6 mA/cm2, a peak luminance of 89500 cd/m2, and the maximum values of EQE and luminescence efficiency are 15% and 14.9 cd/A, respectively. The performance of the fabricated devices can be further improved providing much more in-depth studies on the CdZnSe/ZnSe QDs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 11
·8571-8580
·
IF 3.442
Liu Ying,Dai Fangxu,Zhao Ruiyang,Huai Xudong,Han Jishu,Wang Lei
A novel water-soluble core/shell/shell CdSe/CdS/ZnS quantum dot (QD) is prepared and employed as photocatalysts in the water splitting for hydrogen production. The combination of CdSe with CdS shell and ZnS shell effectively enhances the light harvest ability of the photocatalyst in the visible region, facilitates the separation and transfer of photoinduced electrons and holes and inhibits the recombination of photogenerated electron–hole pairs. The results of photocatalytic hydrogen production show that the amount of hydrogen produced by CdSe/CdS/ZnS QDs increases significantly within 7 h compared with CdSe QDs and CdSe/CdS QDs. In addition, the excellent recyclability of the photocatalyst makes it more promising for practical application.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2019
·Vol. 2019
·期 33
·3734-3739
·
IF 2.578
Jie Hu,Mu Li,Kun Chen,Panchao Yin
Graphical A phase transfer approach to controllably assemble core-shell nanoparticles through two different sized CdSe QDs and tri-lacunary Keggin-type POMs functionalized with thiol groups. A co-assembly protocol of quantum dots (QDs)-polyoxometalates (POMs) hybrids is developed using Keggin-type POMs as surface capping ligands. Phase transfer strategy is used to prepare POM-QDs nanocomposites. These newly developed hybrid materials have been explored for their optical properties and aggregation behavior in solutions. UV/Vis and FT-IR are used to reveal the optical properties of POM-QDs. Small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) are applied to characterize the co-assembled core-shell structures of POM-QDs complexes under different reaction conditions. A general trend to be noted is that the average photoluminescence (PL) lifetime of QDs decreases after phase transfer. The lifetime attenuation is caused by the surface property change of newly obtained POM-QDs complexes, which is resulted from the changed band edge recombination and shallow trap assisted recombination.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Fangxu Dai,Ruiyang Zhao,Xudong Huai,Jishu Han,Lei Wang,Shouhua Feng
Magnetic ZnFe 2 O 4 @ZnSe hollow nanospheres were fabricated by a two-step method and applied for visible light photocatalytic water splitting . Magnetic ZnFe 2 O 4 hollow nanosphere was prepared by using the carbonaceous microsphere as a template, and ZnSe nanoparticles were in site grown on the ZnFe 2 O 4 surface. Through optimizing the reaction time, ZnFe 2 O 4 @ZnSe hollow nanospheres exhibited efficient light absorption and improved photocatalytic performance, and ZnFe 2 O 4 @ZnSe-20 with suitable ZnSe shell thickness possessed highest hydrogen production amount in 6 h (16897.3 μmol/g). The experimental results revealed that the formation of heterojunction between ZnSe and ZnFe 2 O 4 effectively separated and transferred the photo-induced electrons and holes, and inhibited the electron-hole pairs recombination. In addition, the magnetic recyclability of ZnFe 2 O 4 @ZnSe hollow nanospheres was beneficial to further photocatalytic hydrogen production application.
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 6
·1382-1387
·
IF 5.934
Yuanmeng Zhao,Guixiang Mao,Chaozhang Huang,Ping Cai,Gongzhen Cheng,Wei Luo
Searching for highly efficient and stable electrocatalysts applied for the hydrogen evolution reaction (HER) in an alkaline solution is highly desirable, but still remains a challenge due to the sluggish water dissociation kinetics. Herein, in this work, ultrafine Ru nanoparticle (NP) decorated WSe2 nanosheets have been successfully prepared by a colloidal synthetic approach. Benefiting from the interfacial synergy effect between WSe2 nanosheets and Ru NPs, the rate-determining water dissociation step for the alkaline HER and the subsequent hydrogen generation step are speeded up. As expected, the resultant Ru–WSe2 hybrid with 1.93 wt% Ru loading exhibits excellent catalytic performance for HER media, with an overpotential of 87 mV to achieve a current density of 10 mA cm−2, and superior long-term stability.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yan Cheng,Yue Zhao,Huanqin Zhao,Hualiang Lv,Xiaodong Qi,Jieming Cao,Guangbin Ji,Youwei Du
MoSe 2 is a compelling narrow-band-gap semiconductor with particular lamellar crystal structure, but which is rarely used as microwave absorber filler. Owing to the analogue molecular structure with MoS 2 , it may be a potential dielectric dissipation candidate. The hierarchical flower-like structure has been wide accepted as attractive morphology due to its possible strong multiple scattering and reflecting abilities for microwave, thus, in this study, we employed a facile solvothermal process to fabricate the unique flower-like MoSe 2 spheres for eliminating microwave interference issue. Further through the precise tuning of morphology configurations of flower-like MoSe 2 , the effective absorption to specific microwave frequency band can be well optimized, even including low-frequency band. The microwave absorption (MA) performance results show that the dense-flower samples could achieve full absorption in Ku-band and blooming-flower samples cover the entire X-band. The hollow-flower sample is good at absorption in low frequency of C-band and X-band. Our work not only develops outstanding microwave absorber candidates through delicate nanostructure design, but also paves a new way for tuning effective frequency band via tailoring morphology configurations.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 23
·8279-8287
·
IF 4.052
Bo Lin,Zhiping Lin,Shougang Chen,Meiyan Yu,Wen Li,Qiang Gao,Mengyao Dong,Qian Shao,Shide Wu,Tao Ding,Zhanhu Guo
An efficient hydrogen evolution reaction (HER) depends essentially on high-performing electrocatalysts. The aggregation of catalysts normally deteriorates their activity and stability. In this study, a two-step route was used to synthesize surface intercalated well-dispersed spherical MoS2xSe2(1−x) nanocatalysts. The resulting catalysts present a highly active and stable performance towards the HER with an overpotential of −143 mV at 10 mA cm−2, and a Tafel slope of 53.8 mV dec−1. The mechanism for the enhanced HER was analyzed and was attributed to three factors: (i) large numbers of defects and edge active sites arising from the coexistence of S and Se elements; (ii) enhanced electric conductivity arising from the phase transition from the semiconducting 2H-phase to metallic 1T-phase during the intercalation process; and (iii) enlarged contact areas between active sites and electrolyte caused by the increased surface roughness due to the surface intercalation. This work not only deepens our understanding of the improved HER performance of surface intercalated catalysts, but also provides novel strategies for preparing durable electrocatalysts through surface engineering.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Xiao Shao,Tianyong Zhang,Bin Li,Minghao Zhou,Xiaoyuan Ma,Jingchao Wang,Shuang Jiang
Ligand-induced chirality in core/shell nanocrystals (NCs) has attracted extensive attention because of many valuable potential applications. However, the cause of chirality especially in semiconductor nanomaterials is still under debate despite the creation of chiral type I core/shell structures. Herein, we synthesized a kind of new Cu2S/CdSe core/shell nanostructure to study the underlying reason. Four samples of Cu2S/CdSe were synthesized utilizing successive ion layer adsorption and reaction to vary the thickness of the CdSe shell upon a Cu2S core with 5 nm diameter. The chirality of type II Cu2S/CdSe NCs is imparted by l-/d-cysteine and penicillamine, which could be modulated with an increasing thickness of the CdSe shell. To the best of our knowledge, this is the first report of chiral type II core/shell semiconductor NCs. The hybridization theory can explain the variation trend of g factors with every increase in shell thickness from four monolayers (4 ML) to 7 ML. The results indicate that the chiroptical activity of semiconductor NCs is mainly due to hybridization between the holes in the valence band of NCs and the highest occupied molecular orbitals of the chiral ligands. In addition, Cu2S/CdSe NCs show a better chiroptical intensity in comparison with the type I structure according to previous work. The first design of chiral type II Cu2S/CdSe core/shell NCs and a detailed investigation of chiral variation trend help to give a better understanding of the chiral interaction between ligands and core/shell semiconductor nanostructures.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Peiman Xu,Jinming Zhang,Zhifeng Ye,Yiyi Liu,Tianlun Cen,Dingsheng Yuan
Tailoring low-cost electrocatalysts with high activity and good stable for hydrogen evolution reaction (HER) is vital to energy harvesting and storage. Herein, Co doped Ni 0.85 Se nanoparticles supported on reduced graphene oxide (Co Ni 0.85 Se/RGO) were synthesized by a facile one-step hydrothermal method . As expected, the resulting hybrid materials effectively inhibit the aggregation of nanoparticles and possess the enhanced intrinsic conductivity, leading to exposure of more active sites and the faster electron transport . And then these beneficial effects enable Co Ni 0.85 Se/RGO efficient HER catalytic activity in both acid and basic electrolytes, achieving small overpotentials of 148 and 128 mV at a current density of 10 mA cm − 2 in 0.5 M H 2 SO 4 and 1.0 M KOH, respectively.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）