RSC Advances
·
2015
·Vol. 5
·期 124
·102700-102706
·
IF 3.84
Zhijun Huang,Fengbo Li,Bingfeng Chen,Guoqing Yuan
Porous and low-defect graphitic carbon nitride (g-C3N4) nanotubes were fabricated through heating precursors synthesized by recrystallization from H2SO4/methanol. The textural and chemical structures of the as-prepared samples were well studied. Recrystallization and subsequent heating result in g-C3N4 nanotubes with developed porosity and high specific surface area. Unexpectedly, the nanotubes exhibit much ordered tri-s-triazine conjugated network and fewer defects. Compared to bulk g-C3N4 prepared by direct heating melamine, the nanotubes demonstrate enhanced photocatalytic activity for hydrogen evolution under visible light irradiation. Besides the improved textural and chemical structures, the optimized optical and electronic properties are contributed to the enhanced photocatalytic performance.
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INORGANIC CHEMISTRY
·
2015
·
IF 4.762
Fangfang Zhong,Ahmet Karatay,Liang Zhao,Jianzhang Zhao,Cheng He,Caishun Zhang,Halime Gul Yaglioglu,Ayhan Elmali,Betül Küçüköz,Mustafa Hayvali
Pt(II) dbbpy bisacetylide (dbbpy = 4,4′-di(tert-butyl)-2,2′-bipyridine) complex (Pt-1) with two different Bodipy ligands was prepared with the goal to attain broad-band visible light absorbing, efficient funneling of the photoexcitation energy (via resonance energy transfer, RET) to the energy acceptor and high triplet formation quantum yields. Construction of the above-mentioned molecular structural motif is challenging because two different arylacetylide ligands are incorporated in the complex; normally two homoleptic acetylide ligands were used for this kind of N∧N Pt(II) complexes. A reference complex with trans bis(tributylphosphine) Pt(II) bisacetylide protocol (Pt-4) was prepared for comparison of the photophysical properties. The two different Bodipy ligands in Pt-1 and Pt-4 constitute singlet/triplet energy donor/acceptor, as a result the harvested photoexcitation energy can be funneled to the triplet state confined on one of the two Bodipy ligands. The photophysical properties of the complexes were studied with steady state UV–vis absorption and luminescence spectroscopies, femto- and nanosecond transient absorption spectroscopies, cyclic voltammetry, as well as DFT/TDDFT calculations. Fluorescence/phosphorescence dual emission were observed for the complex. The ultrafast intramolecular singlet/triplet energy transfer in Pt-1 was confirmed by the transient absorption spectroscopy (kFRET = 2.6 × 1011 s–1, ΦFRET = 87.1%) followed by an intersystem crossing (kISC = 1.9 × 1010 s–1), and the triplet state lifetime (τT) is 54.1 μs. The reference complex Pt-4 shows drastically different kinetics with kFRET = 6.9 × 1010 s–1, ΦFRET = 81.0%, kISC = 5.83 × 109 s–1, and τT = 147.9 μs. Different singlet oxygen (1O2) quantum yields (ΦΔ = 75% and 70%) and triplet state quantum yields (ΦT = 91% and 69%, respectively) were observed for complexes Pt-1 and Pt-4.
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高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Yong Liu,Kai Yan,Jingdong Zhang
Graphitic carbon nitride (g-C3N4) is a new type of metal-free semiconducting material with promising applications in photocatalytic and photoelectrochemical (PEC) devices. In the present work, g-C3N4 coupled with CdS quantum dots (QDs) was synthesized and served as highly efficient photoactive species in a PEC sensor. The surface morphological analysis showed that CdS QDs with a size of ca. 4 nm were grafted on the surface of g-C3N4 with closely contacted interfaces. The UV–visible diffuse reflection spectra (DRS) indicated that the absorption of g-C3N4 in the visible region was enhanced by CdS QDs. As a result, g-C3N4–CdS nanocomposites demonstrated higher PEC activity as compared with either pristine g-C3N4 or CdS QDs. When g-C3N4–CdS nanocomposites were utilized as transducer and tetracycline (TET)-binding aptamer was immobilized as biorecognition element, a visible light-driven PEC aptasensing platform for TET determination was readily fabricated. The sensor showed a linear PEC response to TET in the concentration range from 10 to 250 nM with a detection limit (3S/N) of 5.3 nM. Thus, g-C3N4 sensitized with CdS QDs was successfully demonstrated as useful photoactive nanomaterials for developing a highly sensitive and selective PEC aptasensor.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Mingyang Xu,Helin Niu,Jinjing Huang,Jiming Song,Changjie Mao,Shengyi Zhang,Chengfeng Zhu,Changle Chen
Visible light photocatalysts have stimulated great research efforts. In this contribution, graphene-like Co 3 S 4 nanosheet/Ag 2 S nanocomposite was prepared using a simple method, and characterized by transmission electron microscopy, X-ray diffraction, and UV–Vis DRS, etc. The photocatalytic properties of the nanocomposite was evaluated by the photocatalytic degradation of Methylene blue (MB) and Methyl orange (MO) under visible light irradiation. The nanocomposite photocatalyst displays excellent stability and photocatalytic activity compared with pure Co 3 S 4 nanosheet or Ag 2 S nanoparticles. The superior photocatalytic properties were attributed to its unique structures, which could promote efficiently electron/hole separation and transportation.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Yingjun Li,Qin Wang,Baocang Liu,Jun Zhang
BiOCl nanosheets with tunable lamella thickness and dominantly exposed {0 0 1} facets were selectively synthesized via a facile hydrothermal method. By modifying the synthetic parameters, such as the amount of P123 and mannitol, the reaction time, types of surfactants, the size, thickness, morphologies, and percentage of {0 0 1} facets over BiOCl nanosheets were well controlled. The exposed {0 0 1} facets with high surface energy and high density of oxygen atoms are not only conducive to the adsorption of the rhodamine B (RhB) dye but also can accumulate the photo-generated electrons, which can be captured by O 2 and converted into reactive oxygen species O 2 − . Therefore, the resultant ultrathin BiOCl nanosheets with exposed {0 0 1} facets exhibit superior catalytic activity for dye photosensitization degradation under visible light irradiation. Impressively, the ultrathin BiOCl nanosheets prepared with P123 and mannitol manifest superior catalytic activity and RhB was completely degraded within 20 min. Our current work is expected to offer a new insight into photocatalytic theory for better understanding of visible light photocatalytic reactions and rational design of highly active photocatalysts.
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Materials Research Express
·
2015
·Vol. 2
·期 9
·095021
·
IF 0
Chuhang Zhang,Yuanxin Feng
A gold (Au) nanoparticle (NP) supported photocatalyst is synthesized by vapor-depositing Au atoms onto SrTiO3 (100) and the photocatalytic water oxidation efficiency is investigated by measuring the photocurrent. Loading of Au NPs onto SrTiO3 dramatically improves the photocurrent and induces a visible-light response of SrTiO3. Small-sized NPs with plateau shape and larger NPs with spherical shape are more reactive under UV and visible irradiation, respectively. The maximum photocurrents under UV and visible-light illumination approach 7.0 mA cm−2 and 32.0 μA cm−2. The onset of visible light response is attributed to the localized surface plasmon resonance of the Au NPs.
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DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 41
·18227-18236
·
IF 4.197
Ruowen Liang,Rui Chen,Fenfen Jing,Na Qin,Ling Wu
H3PMo12O40 molecules have been successfully encapsulated in the cavities of MIL-100(Fe) via a facile hydrothermal method (denoted as HPMo@MIL-100(Fe)). A series of characterization has corroborated the insertion of H3PMo12O40 within the cavities of MIL-100(Fe). The resulting HPMo@MIL-100(Fe) nanocomposites have exhibited much higher photoactivity than the original-MIL-100(Fe) toward the photocatalytic selective oxidation of benzylic alcohols and the reduction of Cr(VI) under visible light irradiation (λ ≥ 420 nm). The higher photoactivity of HPMo@MIL-100(Fe) can be attributed to the integrative effect of enhanced light absorption intensity and more efficient separation of photogenerated electron–hole pairs. The host porous structure of MIL-100(Fe) can achieve a uniform composition with H3PMo12O40, which is significantly important for producing highly reactive dispersed H3PMo12O40 molecules and enhancing the photocatalytic activity of HPMo@MIL-100(Fe) nanocomposites. And the immobilized H3PMo12O40 molecules are more convenient for recycling. Importantly, almost no Fe and Mo ions leach from the MIL-100(Fe) during the reaction, which verifies the photostability of the HPMo@MIL-100(Fe). In addition, possible photocatalytic redox reaction mechanisms have been investigated.
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RSC Advances
·
2015
·Vol. 5
·期 23
·17667-17675
·
IF 3.84
Jian-Wen Shi,Chang Liu,Chi He,Jun Li,Chong Xie,Shenghui Yang,Jian-Wei Chen,Shi Li,Chunming Niu
C-doped TiO2 nanoplates (CTNP) with exposed {001} facets were successfully synthesized by hydrothermal treatment of TiC powder in a HF–HNO3 mixed aqueous solution for the first time. The effects of hydrothermal temperature (140, 160, 180 and 200 °C) on the crystal phase, morphology, specific surface area and porous properties, surface element composition, optical response properties of the resultant samples were investigated in detail, and the photocatalytic activities of these obtained CTNP samples for the degradation of methylene blue (MB) were evaluated under visible light irradiation. The results showed that precursor cubic TiC was transformed into anatase TiO2 with the morphology of well-defined nanoplate completely after hydrothermal treatment for 30 h. The specific surface area of CTNP was significantly improved in comparison with that of micrometer sized C-doped TiO2 plates (CTP) due to smaller particle size. Due to C-doping, CTNP presented red-shift absorption edge, which supported it with strong visible-light response. All these factors led to as-prepared CTNP having more excellent visible-light photocatalytic activity in comparison with micrometer sized CTP. The CTNP synthesized at 180 °C presented the optimal visible-light photocatalytic activity with a high reaction rate constant (0.03692 min−1) among the four CTNP samples. Based on the results of the present study, a reasonable mechanism of photocatalysis on CTNP under visible light was proposed.
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CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Chao Wang,Miaomiao Wu,Ming Yan,Hongqiang Shen,Fanpeng Cai,Bo Hu,Weidong Shi
Highly efficient visible-light-driven Ag 3 PO 4 /WO 3 photocatalysts with different mole fractions of Ag 3 PO 4 nanocrystals have been synthesized via an in situ precipitation method. Characterization results showed the in situ growth of finely distributed Ag 3 PO 4 nanocrystals on the surface of the WO 3 nanosheets . Under visible light irradiation, the Ag 3 PO 4 /WO 3 photocatalysts exhibited enhanced photocatalytic activity compared with bare Ag 3 PO 4 or WO 3 for the degradation of methyl blue, and the highest activity was reached by the Ag 3 PO 4 /WO 3 hybrid photocatalyst with 20 at% of Ag 3 PO 4 . The observed improvement in photocatalytic activity is associated with the extended absorption in the visible light region resulting from the attached Ag 3 PO 4 nanocrystals, and the effective separation of photo-induced carriers at the Ag 3 PO 4 /WO 3 interfaces. In addition, on the basis of the quenching effects of different scavengers and estimated energy band positions, the mechanism of enhanced photocatalytic activity is proposed.
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Chinese Physics B
·
2013
·Vol. 22
·期 11
·117805
·
IF 1.148
Zhang Xiao-Jin,He Zhi-Qun,Wang Jing,Mu Lin-Ping,Zhao Huan,Liang Chun-Jun,Zhuang Qi-Xin,Han Zhe-Wen
In this work, we report the preparation of a series of electroluminescent (EL) devices based on a high-performance polymer, poly(p-phenylene benzobisoxazole) (PBO), and their optoelectronic properties, which have been rarely explored. The device structure is optimised using a complex cathode structure of tris-(8-hydoxyquinoline) aluminium (Alq3)/LiF/Al. By tuning the thickness of the Alq3 layer, we improve the device efficiency dramatically in an optimized condition. Further analysis reveals that the Alq3 layer in the complex cathode structure acts as a hole blocker in addition to its electron-injection role. A green light emission with a maximum brightness of 8.7 × 103 cd/m2 and a moderate current efficiency of 4.8 cd/A is obtained. These values are the highest ever reported for PBO devices. The high operational stability demonstrated by the present device makes it a promising tool for display and lighting applications. A new material is added to the selection of polymers used in this field up to now.
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BIOMATERIALS
·
2013
·
IF 7.604
Zhiwei Li,Chao Wang,Liang Cheng,Hua Gong,Shengnan Yin,Qiufang Gong,Yonggang Li,Zhuang Liu
Magnetic targeting that utilizes a magnetic field to specifically delivery theranostic agents to targeted tumor regions can greatly improve the cancer treatment efficiency. Herein, we load chlorin e6 (Ce6), a widely used PS molecule in PDT , on polyethylene glycol (PEG) functionalized iron oxide nanoclusters (IONCs), obtaining IONC–PEG–Ce6 as a theranostic agent for dual-mode imaging guided and magnetic-targeting enhanced in vivo PDT. Interestingly, after being loaded on PEGylated IONCs, the absorbance/excitation peak of Ce6 shows an obvious red-shift from ∼650 nm to ∼700 nm, which locates in the NIR region with improved tissue penetration. Without noticeable dark toxicity, Ce6 loaded IONC–PEG (IONC–PEG–Ce6) exhibits significantly accelerated cellular uptake compared with free Ce6, and thus offers greatly improved in vitro photodynamic cancer cell killing efficiency under a low-power light exposure. After demonstrating the magnetic field (MF) enhanced PDT using IONC–PEG–Ce6, we then further test this concept in animal experiments. Owing to the strong magnetism of IONCs and the long blood-circulation time offered by the condensed PEG coating, IONC–PEG–Ce6 shows strong MF-induced tumor homing ability, as evidenced by in vivo dual modal optical and magnetic resonance (MR) imaging. In vivo PDT experiment based magnetic tumor targeting using IONC–PEG–Ce6 is finally carried out, achieving high therapeutic efficacy with dramatically delayed tumor growth after just a single injection and the MF-enhanced photodynamic treatment. Considering the biodegradability and non-toxicity of iron oxide, our IONC–PEG–Ce6 presented in this work may be a useful multifunctional agent promising in photodynamic cancer treatment under magnetic targeting.
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CURRENT APPLIED PHYSICS
·
2013
·
IF 1.814
Qi-fei Lu,Jian Li,Da-jian Wang
A single-phased (Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphor with 660 nm-featured dual band-emission is investigated upon optimizing composition to simulate the artificial photosynthetic action spectrum (PAS) for near-ultraviolet (NUV) biological light-emitting diodes (bio-LEDs). A specific composition range in Ba–Sr binary solid solution of (Ba,Sr) 3 MgSi 2 O 8 is found to be capable of obtaining single-phased host in the absence of an easily formed orthosilicate impurity, leading to a 660 nm-featured red band emission of Mn 2+ induced by an efficient energy transfer from a co-doped blue-emitting Eu 2+ sensitizer. This dual broad band emission phosphor has a 72 nm full width at half maximum (FWHM) for red band that covers fairly well to the absorption spectrum of chlorophyll and PAS for most plants, enabling a flexible option in the application of bio-illumination for artificial photosynthesis.
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