APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Peng Wang,Xiao Li,Jialin Fang,Danzhen Li,Jing Chen,Xiaoyun Zhang,Yu Shao,Yunhui He
Anatase TiO 2 with exposed {0 0 1} facets (denoted as T001) is becoming one of the hotspots in photocatalytic field due to the highly reactive {0 0 1} facets. Nowadays, to further extend the applications of T001 in visible region, researchers are struggling to develop T001-based visible-light-responsive photocatalysts. In this paper, for the first time, CdSe quantum dots (QDs)-decorated T001 (denoted as CS-T001) was synthesized successfully via a facile method and demonstrated as a highly efficient and stable photocatalyst for reduction of nitro aromatics under visible light irradiation. Besides the obviously extended light absorption in visible region, the decoration of CdSe QDs onto T001 would remarkably improve the transfer and separation efficiency of photogenerated charge carriers, resulting in the much higher activity of CS-T001 as compared with pure T001 and CdSe QDs. Serving as the accepted sites for photoelectrons generated from CdSe QDs, the substrate T001 also plays a vital role. First, T001 offers highly active reaction sites due to the much higher surface energy of {0 0 1} facet than that of {1 0 1} facet. Second, compared with CdSe QDs-decorated anatase TiO 2 with exposed {1 0 1} facets (denoted as CS-T101), CS-T001 can generate electrons with stronger reducibility to participate in the photocatalytic reduction process. Third, the aggregation of T001 nanosheets gives rise to the porous structures with slit-like pores, providing efficient transport pathways to reactant and product molecules. Fourth, CS-T001 possesses much higher separation efficiency of photogenerated charge carriers as compared to CS-T101. We believe that our work could not only provide a facile method for fabricating novel QDs-decorated T001 photocatalysts but also help us to realize the synergy between decoration of QDs and exposure of TiO 2 {0 0 1} facets during the photocatalytic reaction process.
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高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Shuaishuai Ni,Yanjie Su,Zhe Ai,Jing Hu,Zhi Yang,Eric Siu-Wai Kong,Yafei Zhang
Hexagonal CuSe 1− x S x nanoflakes with 200–600 nm edge in length and 15–20 nm thick have been successfully synthesized via a concentrated alkaline hydrothermal method from CuCl, Se and S powders. Experimental results indicate that the reaction conditions such as NaOH concentration, reaction temperature, surfactant category and Cu source greatly affect the morphology of as-synthesized CuSe 1− x S x nanoflakes. Moreover, their bandgaps are tunable as a function of x (0.1–0.5), which can be easily realized by changing the ratio of Se/S in the starting mix. The photocatalytic degradation of organic methylene blue (MB) with CuSe 1− x S x and H 2 O 2 addition under visible light irradiation has also been studied. Degradation time for the MB aqueous solution (2×10 −5 M) was about 15 min for CuSe 1− x S x nanoflakes with different x values (0.1–0.5), indicating the excellent photocatalytic activities of the hexagonal CuSe 1− x S x nanoflakes.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 8
·1-11
·
IF 2.175
Zhang Qiang,Cao Yongqiang,Shen Jianxing,Yang Ping
Nearly monodisperse CdSe/CdS and CdSe/Cd
x
Zn 1− x
S core–shell quantum dots (QDs) were synthesized by the epitaxial growth of CdS or Cd
x
Zn 1– x
S shells on pre-synthesized CdSe cores through a facile organic route. The thickness effect of CdS and Cd
x
Zn 1− x
S shells on the properties of resulting core–shell QDs, such as the photoluminescence (PL) efficiency, PL full width at half-maximum (fwhm), and PL decay lifetime, were investigated. The PL efficiency is greatly enhanced from 9 % of CdSe cores to 64 % of CdSe/Cd
x
Zn 1− x
S core–shell QDs. The PL spectra are narrowed after coating (fwhm ~28–32 nm). The alloy Cd
x
Zn 1− x
S shell is especially effective to enhance the PL efficiency, and it leads to a smaller red-shift in PL spectra compared with that of the CdS shell. The water-soluble CdSe/Cd
x
Zn 1− x
S core–shell QDs were obtained by the encapsulation of amphiphilic poly(styrene-co-maleic anhydride) (PSMA)–ethanolamine (EA) polymers, which was initially dispersed in oil phase. It was found that the CdSe/Cd
x
Zn 1− x
S QDs in water still retained a high PL efficiency as well as a small value in fwhm after encapsulating the CdSe/Cd
x
Zn 1− x
S QDs with PSMA–EA polymers, expanding the applications of these core–shell QDs in aqueous environment.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
Ji-Ming Song,Yu Liu,He-Lin Niu,Chang-Jie Mao,Long-Jiu Cheng,Sheng-Yi Zhang,Yu-Hua Shen
Cu 2 SnSe 3 (copper tin selenide, CTSe) is one of promising copper-based selenides materials in the use of acousto-optic and photovoltaic fields. In this communication, the CTSe nanocrystals was successfully synthesized by a “hot-injection” protocol in the presence of oleylamine (OLA). Selenium powder dissolved in the mixed solution of OLA and dodecanethiol (DT) were injected into a hot solution of OLA, including copper chloride, tin chloride, at a given reaction temperature. The structure, composition and morphology of the synthesized samples were characterized via using powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and field-emission scanning electron microscopy (SEM). The results revealed that the as-synthesized nanocrystals were single phase polycrystalline, cubic crystal structure, and high monodispersity with an average diameter of 5 nm. The thermoelectric properties of these dense materials compacted from nanocrystals with the temperature range from 300 K to 598 K were studied. The results exhibit a promising figure-of-merit ZT at 598 K, and it demonstrates that the prepared CTSe could potentially be useful for efficient thermoelectric materials.
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Polymer Chemistry
·
2013
·Vol. 4
·期 14
·4017-4023
·
IF 5.231
Tongbing Sun,Yong Jin,Rui Qi,Shaojun Peng,Baozhu Fan
A novel diselenide-containing mono-cleavable amphiphilic di-block polymer, denoted MPEG-IPDI-SeSe-IPDI-PPG, composed of one hydrophilic poly(ethylene glycol) monomethyl ether (MPEG) block and one hydrophobic polypropylene glycol (PPG) block, was synthesized via four coupling reactions in sequence. MPEG-IPDI-SeSe-IPDI-PPG is able to self-assemble into spherical micelles in aqueous solution. Subsequently, it was found that the spherical micelles have a oxidation-responsiveness and undergo a morphology transformation from spherical micelles to large compound micelles (LCMs) in an oxidative environment (0.5%wt H2O2) due to the unique oxidation-responsive cleavage of the diselenide group, resulting in an initially fast release of loaded Rhodamine B (RB), followed by slow, continuously increasing release. It is anticipated that these mono-cleavable polymer micelles containing diselenide may find application in the field of drug delivery systems.
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高影响因子
SOLID STATE IONICS
·
2015
·
IF 2.561
Yaohui Qu,Zhian Zhang,Yanqing Lai,Yexiang Liu,Jie Li
A novel bimodal porous carbon (BPC) with high surface area was prepared by a simple hydrothermal route and KOH activation process , and the Se–BPC composite was synthesized for lithium–selenium batteries by the melt-diffusion method. It is found that the elemental selenium was dispersed inside the pores of BPC based on the analyses. Electrochemical tests reveal that the Se–BPC composite has a large reversible capacity and high rate performance as cathode materials . The Se–BPC (45.1 wt.% Se) composite displays an initial discharge capacity of 552 mAh g − 1 and a reversible discharge capacity of 264 mAh g − 1 after 80 cycles at 1 C charge/discharge rate. In particular, the Se–BPC composite presents a durable cycling performance at high rate of 2 C. These outstanding electrochemical features of Se–BPC composite cathode should be attributed to the uniform BPC with high surface area and bimodal porous structure . The bimodal porous carbon would be a promising carbon matrix to develop high performance lithium–selenium batteries.
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JOURNAL OF CRYSTAL GROWTH
·
2015
·
IF 1.698
Huacheng Cai,Wendong Wang,Peiwen Liu,Guangming Wang,Ankang Liu,Zhe He,Zhaofang Cheng,Shengli Zhang,Minggang Xia
We demonstrate tin (Sn) nanowires growth enhanced by Selenium (Se) atoms via physical vapor transport (PVT) method. The Raman spectroscopy, X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy show that Sn nanowires are synthesized with a large quantity, good quality and high purity of Sn. The growth of Sn nanowires is attributed to Solid–Vapor–Liquid mechanism. The effects of gold nanoparticles catalyst, Si substrate, and Se atoms on Sn nanowires growth are discussed in detail. We find that Se atom plays a key role in the growth of Sn nanowires. The gaseous Sn atoms are absorbed by the eutectic alloy droplets of Se–Au at first. Then Sn atoms precipitate at the liquid–solid phase interface due to a supersaturated solution and form a one-dimensional nanostructure. In all, this PVT method could provide a simple and quick way to synthesize monocrystalline Sn nanowires with an advantage in both quality and quantity. The optical transmittance of Sn nanowires thin film with 2 μm 2 density approaches 85–90% in visible wavelength. Therefore, the Sn nanowires thin film can be applied to transparent electrode along with their metallic property.
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RSC Advances
·
2014
·Vol. 5
·期 6
·4162-4170
·
IF 3.708
Xinfeng Cheng,Yong Jin,Tongbing Sun,Rui Qi,Baozhu Fan,Hanping Li
A novel diselenide crosslinked poly(N-isopropylacrylamide-co-2-hydroxyethyl acrylate) hydrogel was successfully synthesized and characterized. The resultant hydrogel showed a swelling–shrinkage behavior as a function of external temperature because of the unique hydrophilic–hydrophobic transition of poly(N-isopropylacrylamide) (PNIPAM) segments. In addition to the temperature-dependent response, the oxidation-induced gel-to-sol transition of the hydrogel was also observed. The salicylic acid (SA) loaded hydrogels were prepared in order to investigate their stimuli-responsive release behaviors. The cumulative release profile of the SA-loaded hydrogels showed a thermo-induced slow sustained drug release and an oxidation-induced quick burst release, exhibiting temperature/oxidation dual-stimuli-responsive drug release. This novel type of hydrogels may hold great promise for controlled drug delivery systems.
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RSC Advances
·
2014
·Vol. 5
·期 6
·4184-4190
·
IF 3.708
Qingwen Tian,Yong Cui,Gang Wang,Daocheng Pan
The metal chalcogenides are excellent choices as absorbers and buffer-layers in thin film solar cells. Versatile chemical approaches provide endless possibilities to prepare metal sulfide precursor solutions. Recently, Cu2ZnSnS(Se)4 thin films have played an important role in fabricating low-cost and high-efficiency solar cells. Here, we present a robust and low-cost 1,2-ethanedithiol/ethanolamine/2-methoxyethanol ternary solution process to prepare Cu2ZnSnS4 precursor solution and high-quality Cu2ZnSnS4 thin films. Low-cost Cu2O, ZnO and SnO are used as the raw materials, which can be easily dissolved in the 2-methoxyethanol solution of 1,2-ethanedithiol and ethanolamine at room temperature in air. By tuning the composition of the Cu2ZnSn(S,Se)4 thin film with a selenization process, an active-area power conversion efficiency of 7.34% has been achieved for Cu2ZnSn(S,Se)4 solar cell.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Ying Yang,Qiao Liu,Xing-Pei Liu,Ping-Zhen Liu,Chang-Jie Mao,He-Lin Niu,Bao-Kang Jin,Sheng-Yi Zhang
A novel multifunctional reduced graphene oxide (RGO)/Fe 3 O 4 /PDDA/CdSe nanocomposite has been successfully prepared and used as probe for an electrochemiluminescence (ECL) immunosensor of human interleukin-6 (IL-6). The prepared RGO/Fe 3 O 4 /PDDA/CdSe nanocomposite was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–vis) absorption spectroscopy , and a vibrating sample magnetometer (VSM). This nanocomposite shows magnetism, ECL properties, and good biocompatibility. Furthermore, the RGO/Fe 3 O 4 /PDDA/CdSe nanomaterial was applied to develop an ultrasensitive ECL immunosensor for detection of IL-6. The ECL intensity decreased linearly with the IL-6 concentrations in the range 0.002 to 20 ng/mL. Furthermore, the developed ECL immunosensor with high sensitivity, stability and excellent reproducibility can be used for detection of real samples, which make it possible to be used in clinical detection.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 8
·1-12
·
IF 2.278
Yang Ping,Chen Hsueh Shin,Zhang Qiang,Shi Ruixia,Wang Junpeng,Che Quande
To investigate the shell deposited kinetics, CdSe quantum dots (QDs) and nanorods (NRs) with a maximum length of 17 nm were fabricated via organic synthesis routes. CdSe with a hexagonal crystal structure (wurtzite) favors epitaxial growth on the {002} surfaces when well-controlled conditions were used. The morphologies and sizes of CdSe samples depended strongly on chemicals and temperature. In the case of 320 °C, CdSe NRs with adjusted length of 7–17 nm were obtained from trioctylphosphine oxide (TOPO) and tetradecylphosphonic acid (TDPA). In contrast, short CdSe NRs (less than 10 nm) were created from octadecylphosphonic acid (ODPA) and trioctylamine (TOA). Spherical CdSe QDs were further fabricated using stearic acid (SA) and TOPO at 300 °C. CdSe cores were coated with Cd 0.5 Zn 0.5 S and CdTe shells. Anisotropic growth occurred during shell deposition because CdS shells grown preferentially on the {001} facet of the CdSe core. In the case of CdSe core prepared from TOPO and TDPA, CdSe/Cd 0.5 Zn 0.5 S core/shell samples prepared from long CdSe NRs (more than 10 nm) revealed a peanut morphology while the core/shell samples created from short ones (less than 10 nm) exhibited a spherical morphology. All of the CdSe/Cd 0.5 Zn 0.5 S core/shell samples revealed a similar length to that of the CdSe cores. This phenomenon was also observed for the core/shell samples fabricated using CdSe NRs prepared by ODPA and TOA. This is ascribed to the well-developed crystal structure of CdSe NRs fabricated using an organic synthesis at high temperature. In contrast, this anisotropic growth did not occur when spherical CdSe QDs prepared from SA and TOPO and the shell (Cd 0.5 Zn 0.5 S) coating carried out using SA and TOA. To indicate the shell depositing process, CdSe NRs fabricated using TDPA and TOPO were coated with a CdTe shell. CdTe monomers were deposited on the middle and tip parts of the CdSe NRs to form a tetrapod-like morphology at 220 °C. This is ascribed to the large difference of structure of CdSe (hexagonal) and CdTe (zinc blende).
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高影响因子
LANGMUIR
·
2014
·
IF 4.384
Yecang Tang,Qian Yang,Ting Wu,Li Liu,Yi Ding,Bo Yu
In this work, a new assembled glucose sensor based on the Ag nanoparticle (AgNP)-enhanced fluorescence of CdSe quantum dots (QDs) was developed. The mercaptoglycerol-modified AgNPs and aminophenylboronic acid-functionalized CdSe QDs are assembled into AgNP-CdSe QD complexes through the formation of a boronate ester bond. As compared to that of bare CdSe QDs, up to a 9-fold fluorescence enhancement and a clear blue shift of the emission peak for AgNP-CdSe QD complexes were observed, which is attributed to the surface plasmon resonance of AgNPs. In addition, the as-formed complexes are gradually disassembled in the presence of glucose molecules because they can replace the AgNPs by competitive binding with boronic acid groups, resulting in the weakening of fluorescence enhancement. The decrease in fluorescence intensity presents a linear relationship with glucose concentration in the range from 2 to 52 mM with a detection limit of 1.86 mM. Such a metal-enhanced QDs fluorescence system may have promising applications in chemical and biological sensors.
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PubMed
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