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C3N4 core shell

Xiaojie Song, Hongzhi Cui, Ye Han, Lei Ding, Qiang Song
In this work, Ti2 Al(C, N) solid solution with lamellar structure-enhanced TiAl matrix composites was synthesized by vacuum arc melting, using bulk g-C3 N4 , Ti, and Al powders as raw materials. The phases, microstructures, interfaces, and mechanical properties were investigated. MAX phase of Ti2 Al(C, N) solid solution with lamellar structure was formed. During the melting process, first, C3 N4 reacted with Ti to form Ti(C, N) by Ti + C3 N4 → Ti(C, N). Then Ti2 Al(C, N) was formed by a peritectic reaction of TiAl(l) + Ti(C, N)(s) → Ti2 Al(C, N)...
May 16, 2018: ACS Applied Materials & Interfaces
Jin Wang, Hui Xu, Shumin Li, Bo Yan, Yuting Shi, Caiqin Wang, Yukou Du
Plasmonic photocatalyst has attracted significant attention due to its valuable theoretical study and promising practical applications in solar cells, functional composites, and sensors. Herein, an interesting RGO-C3 N4 -supported AuAg core-Au shell (AuAg@Au) nanocomposite has been reported. Due to the surface plasmon resonance (SPR) of AuAg@Au and the accelarated electron transfer and separation of charge carriers induced by the fascinating RGO-C3 N4 substrate, the newly-generated AuAg@Au/RGO-C3 N4 nanomaterials show a strong photo-electrochemical response under visible-light irradiation...
December 4, 2017: Analyst
Jinggang Hao, Shaofeng Zhang, Feng Ren, Zhaowu Wang, Jianfei Lei, Xuening Wang, Tao Cheng, Liben Li
Novel rutile TiO2 @g-C3 N4 core-shell photocatalysts were synthesized by a facile saturated aqueous solution method. The composites were further characterized by using X-ray diffraction (XRD), high-resolution transmission microscopy (HRTEM), UV-visible light diffusion reflectance spectrometry (DRS), X-ray photoelectron spectroscopy (XPS) and so on. The results indicated that an ultrathin layer of g-C3 N4 was in-situ fabricated over the surface of rutile TiO2 nanorod. The rutile TiO2 @ g-C3 N4 core-shell structures showed much higher photo-current and photocatalytic activity for Rhodamine B (RhB) degradation under visible irradiation...
December 15, 2017: Journal of Colloid and Interface Science
Shifei Kang, Hengfei Qin, Lu Zhang, Yongkui Huang, Xia Bai, Xi Li, Di Sun, Yangang Wang, Lifeng Cui
Highly-monodispersed g-C3N4/TiO2 hybrids with a core/shell structure were synthesized from a simple room temperature impregnation method, in which g-C3N4 was coated through self-assembly on the commercially available Degussa P25 TiO2 nanoparticles. Structural and surface characterizations showed that the presence of g-C3N4 notably affected the light absorption characteristics of TiO2. The g-C3N4/TiO2 heterojunctions with metal-free exposed surfaces were directly used as biocompatible photocatalysts for simulated jaundice phototherapy under low-power green-light irradiation...
March 13, 2017: Scientific Reports
Dan Yang, Guixin Yang, Shili Gai, Fei He, Chunxia Li, Piaoping Yang
Combined therapy using multiple approaches has been demonstrated to be a promising route for cancer therapy. To achieve enhanced antiproliferation efficacy under hypoxic condition, here we report a novel hybrid system by integrating dual-model photodynamic therapies (dual-PDT) in one system. First, we attached core-shell structured up-conversion nanoparticles (UCNPs, NaGdF4 :Yb,Tm@NaGdF4 ) on graphitic-phase carbon nitride (g-C3 N4 ) nanosheets (one photosensitizer). Then, the as-fabricated nanocomposite and carbon dots (another photosensitizer) were assembled in ZIF-8 metal-organic frameworks through an in situ growth process, realizing the dual-photosensitizer hybrid system employed for PDT via stepwise water splitting...
March 1, 2017: ACS Applied Materials & Interfaces
Shasha Duan, Guosheng Han, Yongheng Su, Xiaoyu Zhang, Yanyan Liu, Xianli Wu, Baojun Li
Magnetic core-shell structures provide abundant opportunities for the construction of multifunctional composites. In this article, magnetic core-shells were fabricated with Co nanoparticles (NPs) as cores and g-C3N4 as shells. In the fabrication process, the Co@g-C3N4 core-shells were anchored onto the rGO nanosheets to form a Co@g-C3N4-rGO composite (CNG-I). For hydrogen generation from the hydrolysis of NaBH4 or NH3BH3, the Co NP cores act as catalytic active sites. The g-C3N4 shells protect Co NPs cores from aggregating or growing...
June 28, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Zhiping Yan, Zijun Sun, Xiang Liu, Hongxing Jia, Pingwu Du
Photocatalytic hydrogen production from water in a noble-metal-free system has attracted much attention in recent years. Herein we report on the use of core/shell cadmium sulfide/graphitic carbon nitride (CdS/g-C3N4) heterojunction nanorods modified by nickel hydroxide (Ni(OH)2) as a highly efficient photocatalyst for visible light-driven hydrogen production from water. Due to efficient separation of the photoexcited charge carriers in the CdS/g-C3N4 core/shell nanorods and the synergistic effect of Ni(OH)2, the optimal hydrogen evolution rate over Ni(OH)2-CdS/g-C3N4 is 115...
February 28, 2016: Nanoscale
Rui Chen, Jinfeng Zhang, Yu Wang, Xianfeng Chen, J Antonio Zapien, Chun-Sing Lee
Recently, nanoscale metal-organic frameworks (NMOFs) have started to be developed as a promising platform for bioimaging and drug delivery. On the other hand, combination therapies using multiple approaches are demonstrated to achieve much enhanced efficacy. Herein, we report, for the first time, core-shell nanoparticles consisting of a photodynamic therapeutic (PDT) agent and a MOF shell while simultaneously carrying a chemotherapeutic drug for effective combination therapy. In this work, core-shell nanoparticles of zeolitic-imadazolate framework-8 (ZIF-8) as shell embedded with graphitic carbon nitride (g-C3N4) nanosheets as core are fabricated by growing ZIF-8 in the presence of g-C3N4 nanosheets...
November 7, 2015: Nanoscale
Xuehui Pang, Jihong Pan, Picheng Gao, Youying Wang, Liguo Wang, Bin Du, Qin Wei
It was reported that Proprotein convertase subtilisin/kexin type 6 (PCSK6) can promote the progression of rheumatoid arthritis to a higher aggressive status. In this work, a novel visible light induced photoelectrochemical (PEC) platform was designed to detect PCSK6 gene. ZnO@CdTe nanocable arrays/carboxylated g-C3N4 used as the PEC signal generator. Hexagonal ZnO nanorods grew on ITO electrode firstly. CdTe were then electrodeposited on the ZnO nanorods surface to enhance the photogenerated h(+)/e(-) separation efficiency...
December 15, 2015: Biosensors & Bioelectronics
Yunjin Yao, Fang Lu, Yanping Zhu, Fengyu Wei, Xueting Liu, Chao Lian, Shaobin Wang
Novel CuFe2O4@C3N4 core-shell photocatalysts were fabricated through a self-assembly method and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, transmission electron microscopy and Uv-vis diffuse reflection spectroscopy. The photocatalytic performances of the CuFe2O4@C3N4 catalysts were evaluated in photo Fenton-like discoloration of Orange II dye using H2O2 as an oxidant under visible-light irradiation (λ>420 nm)...
October 30, 2015: Journal of Hazardous Materials
Lixia Wang, Fei Zhao, Qing Han, Chuangang Hu, Lingxiao Lv, Nan Chen, Liangti Qu
The assembly of low dimensional g-C3N4 structures in a geometrically well-defined fashion and the complexation of g-C3N4 with other materials are the main approaches to construct fancy structures for special functions. While high temperature was often indispensable for the preparation process, the realization of room temperature assembly of the low dimensional g-C3N4 and the preparation of g-C3N4-based semiconductor composites will provide many additional advantages for new functional materials and applications...
June 7, 2015: Nanoscale
Jianwei Zhou, Mo Zhang, Yongfa Zhu
C3N4/TiO2 hybrid photocatalysts with highly enhanced photocatalytic performance were prepared by a facile ball milling method. A layered structure of g-C3N4 was formed on the surface of TiO2. The mechanochemical process can promote the dispersion of C3N4 on the surface of TiO2 particles, to form a single layer hybrid structure and a multi-layer core-shell structure. The photocatalytic activities of C3N4/TiO2 under visible and UV light irradiation were 3.0 and 1.3 times those of pure g-C3N4 and TiO2, respectively...
February 7, 2015: Physical Chemistry Chemical Physics: PCCP
Santosh Kumar, Arabinda Baruah, Surendar Tonda, Bharat Kumar, Vishnu Shanker, B Sreedhar
N-doped ZnO/g-C3N4 hybrid core-shell nanoplates have been successfully prepared via a facile, cost-effective and eco-friendly ultrasonic dispersion method for the first time. HRTEM studies confirm the formation of the N-doped ZnO/g-C3N4 hybrid core-shell nanoplates with an average diameter of 50 nm and the g-C3N4 shell thickness can be tuned by varying the content of loaded g-C3N4. The direct contact of the N-doped ZnO surface and g-C3N4 shell without any adhesive interlayer introduced a new carbon energy level in the N-doped ZnO band gap and thereby effectively lowered the band gap energy...
May 7, 2014: Nanoscale
Jiye Zhang, Yonghao Wang, Jian Jin, Jun Zhang, Zhang Lin, Feng Huang, Jiaguo Yu
CdS/g-C3N4 core/shell nanowires with different g-C3N4 contents were fabricated by a combined solvothermal and chemisorption method and characterized by X-ray powder diffraction, scanning electronic microscopy, transmission electron microscopy, and UV-vis diffuse reflection spectroscopy. The photocatalytic hydrogen-production activities of these samples were evaluated using Na2S and Na2SO3 as sacrificial reagents in water under visible-light illumination (λ≥420 nm). The results show that after a spontaneous adsorption process g-C3N4 is successfully coated on CdS nanowires with intimate contact and can significantly improve the photocatalytic hydrogen-production rate of CdS nanowires, which reaches an optimal value of up to 4152 μmol h(-1) g(-1) at the g-C3N4 content of 2 wt %...
October 23, 2013: ACS Applied Materials & Interfaces
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