Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Gao Qiqian,Sun Shihan,Li Xuesong,Zhang Xueyu,Duan Lianfeng,Lü Wei
In present work, two-dimensional g-C 3 N 4 was used to modify TiO 2 nanorod array photoanodes for CdS quantum dot-sensitized solar cells (QDSSCs), and the improved cell performances were reported. Single crystal TiO 2 nanorods are prepared by hydrothermal method on transparent conductive glass and spin-coated with g-C 3 N 4 . CdS quantum dots were deposited on the g-C 3 N 4 modified TiO 2 photoanodes via successive ionic layer adsorption and reaction method. Compared with pure TiO 2 nanorod array photoanodes, the g-C 3 N 4 modified photoanodes showed an obvious improvement in cell performances, and a champion efficiency of 2.31 % with open circuit voltage of 0.66 V, short circuit current density of 7.13 mA/cm 2 , and fill factor (FF) of 0.49 was achieved, giving 23 % enhancement in cell efficiency. The improved performances were due to the matching conduction bands and valence bands of g-C 3 N 4 and TiO 2 , which greatly enhanced the separation and transfer of the photogenerated electrons and holes and effectively suppressed interfacial recombination. Present work provides a new direction for improving performance of QDSSCs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiao Fang Zhang,Na Li,Yu Ling,Li Tang,Nian Bing Li,Hong Qun Luo
As one of the DNA damage repair enzymes, uracil-DNA glycosylase (UDG) plays an important role in maintaining genomic integrity. By linked bridge hybridizing-induced split G-quadruplex (SQ), we demonstrate here the construction of a simple and sensitive DNA machine for the detection of UDG activity. The satisfactory split G-quadruplex sequences (SQS) were successfully selected to be the ingredients of SQ formation. In this work, UDG recognized and removed the uracil bases from the stem of hairpin DNA (HP). And then, HP with a low melting temperature hybridized with designed SQS, forming a three-way DNA structure with an SQ. With the addition of Thioflavin T, a dramatical enhancement of fluorescence intensity was presented due to the G-quadruplex/Thioflavin T complex formation. The detection limit was as low as 7.8 × 10 −3 U/mL. And we also successfully investigated the performance of UDG activity in the HeLa cell lysate. This optical DNA machine with the merits of being simple, rapid, and economical was flexibly suitable for not only active UDG assay but also diverse target detection by adjusting the recognition region of the HP.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Junling Duan,Yuanhong Zhang,Yanbin Yin,Houshen Li,Jun Wang,Lusheng Zhu
A facile fluorescence “on-off-on” approach for sensing 6-Thioguanine (6-TG) and Hg 2+ was designed based on g-C 3 N 4 nanosheets. It was found that in the absence of Hg 2+ , the addition of 6-TG to g-C 3 N 4 nanosheets solution resulted in the fluorescence quenching of g-C 3 N 4 nanosheets (turn off). However, in the presence of Hg 2+ , the quenched fluorescence of g-C 3 N 4 nanosheets was recovered (turn on), because the high affinity of Hg 2+ and 6-TG resulted in the loss of molecular interactions between 6-TG and g-C 3 N 4 nanosheets. The quantitative detection of 6-TG was obtained via the fluorescence quenching of g-C 3 N 4 nanosheets with a detection limit of 65 nM. Meantime, the 6-TG-g-C 3 N 4 nanosheets system could be used as a fluorescent “turn on” sensor for Hg 2+ . The detection limit for Hg 2+ was 37 nM. The proposed method showed high selectivity for the detection of 6-TG and Hg 2+ . In addition, it was successfully applied to detect Hg 2+ in real water samples.
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MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Xueru Yan,Ruopeng Xu,Junkang Guo,Xiang Cai,Dengjie Chen,Langhuan Huang,Yongqiang Xiong,Shaozao Tan
A high efficient visible-light-region Cu 2 O/g-C 3 N 4 /RGO composite 3D aerogel photocatalyst was fabricated by a facile self-assemble method. The aerogel composite with various RGO and g-C 3 N 4 to Cu 2 O weight ratios was synthesized and characterized. The results showed that the Cu 2 O/g-C 3 N 4 heterojunction absorbed visible light region shifted to a lower energy. In order to improved photocatalytic activity, the Cu 2 O/g-C 3 N 4 heterojunction loaded on reduced graphene oxide sheets resulted in increasing absorption in the visible light range and improving photodegradation activity. The optimal content of Cu 2 O in the Cu 2 O/g-C 3 N 4 /RGO aerogel was 40%, which exhibited the effectively synthetized Cu 2 O/g-C 3 N 4 heterojunction, and greatly improved photocatalytic activity. Moreover, the ternary composite aerogel exhibited 96% (Methylene Blue) and 83% (Methyl Orange) degradation efficiency within 80 min. The combined heterojunction with synergistic effects of this novel composite aerogel account for the excellent photocatalytic efficiency.
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Nanoscale
·
2013
·Vol. 6
·期 5
·2649-2659
·
IF 6.233
Liming Sun,Yue Qi,Chun-Jiang Jia,Zhao Jin,Weiliu Fan
Fabricating heterojunction photocatalysts is an important strategy for speeding up the separation rate of photogenerated charge carriers, which is attracting greater interest. However, the choice of three factors, individual materials, band offsets, and effective interfaces, is still important for fabricating efficient heterojunction photocatalysts. Herein, efficient g-C3N4/Zn2GeO4 photocatalysts with effective interfaces were designed by controlling the surface charges of the two individual materials inside the same aqueous dispersion medium, making use of the electrostatic attraction between oppositely charged particles. The g-C3N4/Zn2GeO4 heterojunction with opposite surface charge (OSC) showed higher visible-light photocatalytic activity for degradation of methylene blue than those of pure g-C3N4, pure Zn2GeO4, and the g-C3N4/Zn2GeO4 with identical surface charge (ISC). The investigation of the light absorption spectrum, adsorption ability, and photocurrent responses revealed that the improved separation of photogenerated carriers was the main reason for the enhancement of the OSC g-C3N4/Zn2GeO4 sample's photocatalytic activity. By combining with theoretical calculations, we investigated the microscopic mechanisms of interface interaction and charge transfer between g-C3N4 and Zn2GeO4. The photogenerated electrons in the g-C3N4 N 2p states directly excited into the Zn 4s and Ge 4s hybrid states of Zn2GeO4. The strategy of designing and preparing a g-C3N4/Zn2GeO4 composite catalyst in this work is very useful for fabricating other efficient heterojunction photocatalysts.
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ANALYTICAL CHEMISTRY
·
2014
·
IF 5.825
Chenchen Ge,Quan Luo,Dou Wang,Shiming Zhao,Xiaoling Liang,Luxin Yu,Xuerong Xing,Lingwen Zeng
G-quadruplex-forming sequence can be formed through a copper(I) ion (Cu+)-catalyzed click chemistry between azide- and alkyne-modified short G-rich sequences in aqueous solution, eliminating immobilization and washing steps of conventional assays. The source for Cu+ was generated from the reduction of Cu2+ with the reductant of sodium ascorbate. In the presence of hemin and K+, the self-assembly of hemin/G-quadruplex structure has the activity of horseradish peroxidase (HRP), which can catalyze its colorless substrate tetrazmethyl benzidine (TMB) into a colored product. Hence, the concentration of Cu2+ can be evaluated visually for qualitative analysis according to the color change of the solution, and the optical density (OD) value of the resulting solution at 450 nm was also recorded using a microplate reader for quantitative analysis.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Ming Wu,Jun-Min Yan,Xue-wei Zhang,Ming Zhao
The g -C 3 N 4 is synthesized by directly heating the acetic acid treatment melamine. A combination of XRD, SEM, TEM, PL and UV–vis are utilized to characterize the composition, morphology and optical properties of g -C 3 N 4 . This method synthesized g -C 3 N 4 shows smaller particles and some holes which high up the photocatalytic activity compared with the bulk g -C 3 N 4 .
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RSC Advances
·
2015
·Vol. 5
·期 19
·14074-14080
·
IF 3.84
Yuangang Li,Xiaoliang Wei,Huajing Li,Rongrong Wang,Juan Feng,Hui Yun,Anning Zhou
Novel nanoarrays composed of inorganic–organic CdS@g-C3N4 core–shell nanorods were fabricated via a simple hydrothermal treatment and heating process. The samples were characterized by XRD, FESEM, TEM, XPS, FTIR, UV-vis and photoelectrochemical (PEC) measurements. We find that both PEC performance and stability against light illumination of the CdS@g-C3N4 CSNRs are significantly enhanced compared with pure CdS NRs. The photocurrent density of the CdS@g-C3N4 CSNRs reaches up to 1.16 mA cm−2, which is 2.5 times higher than that of pure CdS NRs under the same conditions. More importantly, after 3600 s continuous illumination, the CdS@g-C3N4 CSNRs are quite stable and more than 85% of the initial photocurrent is sustained, while the photocurrent of CdS NRs decays to 20% of the initial value. Finally, a possible mechanism for the enhanced PEC performance and stability of the CdS@g-C3N4 CSNRs heterostructure is proposed and discussed systematically based on our experimental results.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Anye Shi,Huihui Li,Shu Yin,Bin Liu,Jiachi Zhang,Yuhua Wang
Single layer g-C 3 N 4 could be obtained from a protonic acid treatment of g-C 3 N 4 or a new sandwich-like orientation growth of melamine. Through the self-assembly of melamine and polyacrylamide by hydrogen bonds and electrostatic interactions, g-C 3 N 4 , with extended planarized atomic single layer, exhibits superiority in both photocatalytic hydrogen evolution and photocatalytic degradation under visible light irradiation. Besides low efficiency, the acid exfoliation will destroy the delocalized π-system by inducing O atoms. The decrease of conjugation degree increases the optical gaps, making it hard for g-C 3 N 4 to capture photons. On the contrary, the facile sandwich-like orientation growth of melamine highly keeps the conjugation degree of g-C 3 N 4 and extends its delocalized π-system. Such single layer g-C 3 N 4 is more active even better than N-doped TiO 2 under visible light irradiation.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Lin Wu,Yuhong Sha,Wenrou Li,Sui Wang,Zhiyong Guo,Jun Zhou,Xiurong Su,Xiaohua Jiang
A novel, disposable and label-free electrochemiluminescence (ECL) immunosensor, based on multi-functionalized graphitic carbon nitride (g-C 3 N 4 ) coated on the one-off screen-printed carbon electrodes (SPCEs), for the detection of tumor marker carbohydrate antigen 125 (CA125) was developed. The multi-functionalized g-C 3 N 4 was prepared with amino-coated Fe 3 O 4 nanoparticles and CA125 antibody (anti-CA125) chemically bound to the surface of carboxylated g-C 3 N 4 simultaneously. The Fe 3 O 4 nanoparticles ensured the presence of multi-functionalized g-C 3 N 4 in the outer Helmholtz plane (OHP) of the ECL immunosensor and even becoming part of the electrode surface. This assembly promoted the electron transfer between g-C 3 N 4 and the electrode resulting in greatly enhanced ECL intensity. The CA125 was selectively captured by anti-CA125 leading to effective inhibition of the ECL signal. Under optimal conditions, this disposable ECL immunosensor exhibited a wide dynamic linear detection range for CA125 (0.001–5 U/mL) with a lower detection limit of 0.4 mU/mL, providing high sensitivity. In addition, the immunosensor also exhibited high specificity, good reproducibility and long-term stability. All these properties offer great promise for rapid, simple, selective and effective detection of CA125 in clinical applications.
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SENSORS
·
2014
·Vol. 14
·期 12
·22971-22981
·
IF 2.048
Zhenzhu Zheng,Juan Hu,Zhaodong He
A label-free split G-quadruplex and graphene oxide (GO)-based fluorescence platform has been designed to distinguishPseudostellaria heterophylla(PH) from its adulterants based on the differences in their nrDNA ITS sequences. Herein, GO has been first introduced to capture G-rich probes with 2:2 split mode and then decrease the background signal. As T-DNA exists, the probes leave the GO surface to form double-stranded structures followed by the formation of the overhanging G-rich sequence into a G-quadruplex structure, which combines quinaldine red specifically to produce a strong fluorescence signal. In addition, this strategy allows detection of T-DNA in a wide range of concentrations from 1.0 × 10−8to 2.0 × 10−6mol·L−1with a detection limit of 7.8 × 10−9mol·L−1. We hope that the split G-quadruplex/GO platform can be utilized to further develop gene identification sensors in Traditional Chinese Medicine or other analysis areas.Keywords:split G-quadruplex;graphene oxide;fluorescence;Pseudostellaria heterophylla
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高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Lirong Chen,Mengyang Lv,Yanyu Wan,Yu Sun,Zhenchao Gu,Shuaishuai Zhang
g-C 3 N 4 /TiO 2 photocatalysts were in-situ synthesized via a straightforward high-temperature calcination method and used to activate persulfate (PS) to degrade indole under different light irradiation. The prepared g-C 3 N 4 /TiO 2 photocatalysts were characterized by SEM, TEM, XRD, BET, XPS, FTIR, and photocurrent response analysis. The CNT 1:5 (mass ratio of g-C 3 N 4 to TiO 2 of 1:5) and CNT 24:1 (mass ratio of g-C 3 N 4 to TiO 2 of 24:1) showed the best performance in degradation of indole solution under UV and visible light, respectively. Free radical quenching experiments and band structure analysis determined that the UV/CNT 1:5 and PS-Vis/CNT 24:1 systems followed an S-scheme and type-II transfer mechanism, respectively. A detailed analysis using GC-MS revealed the indole's intermediate products and proposed the indole's degradation pathway. Furthermore, using natural water matrices, the removal of other typical organic compounds, including quinoline, pyridine, and phenol, was investigated in the UV/CNT 1:5 and PS-Vis/CNT 24:1 systems. The results of this study promote the application of g-C 3 N 4 /TiO 2 composites as organic degradation catalysts, reflecting the potential of composite materials in the removal of toxic organic compounds in coal chemical wastewater.
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