DYES AND PIGMENTS
·
2012
·
IF 3.126
Lijuan Feng,Chunyu Wang,Zhonglin Ma,Changli Lü
8-Hydroxyquinolines (HQs) functionalized ZnS nanoparticles (NPs) with an amine-capping layer (ZnS–NH 2 –Q NPs) were prepared by a ligand-exchange process. FT-IR, XRD , NMR, TEM and fluorescence spectrometer were used to characterize the novel ZnS–NH 2 –Q NPs. Upon the addition of 2,4,6-trinitrotoluene (TNT), the amino groups on the surface of ZnS–NH 2 –Q NPs can bind TNT molecule from solution by forming Meisenheimer complex. This complex absorbs the green part of visible light, and strongly suppresses the fluorescence emission of the ZnS–NH 2 –Q NPs through Fluorescence Resonance Energy Transfer (FRET). The observed linear fluorescence intensity response for TNT in the range of 0–1.89 μM allows the quantitative detection TNT, with a detection limit down to 10 nM.
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Tao Yang,Renzhong Yu,Huaiyin Chen,Ruirui Yang,Shiying Wang,Xiliang Luo,Kui Jiao
Recently, molybdenum disulfide-based nanocomposites have been widely used in electrochemical sensing area. In this paper, molybdenum disulfide-poly( m -aminobenzenesulfonic acid) (MoS 2 -PABSA) nanocomposite was prepared through a simple electropolymerization procedure for TNT detection. The pre-obtained thin-layered MoS 2 nanosheet was adopted as the scaffold in the electropolymerization process and the m -aminobenzenesulfonic acid monomer was effectively electrodeposited on it via cyclic voltammetry . The morphology and electrochemical behaviors of MoS 2 -PABSA nanocomposite were investigated by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and some electrochemical methods. The obtained nanocomposite possesses excellent electrochemical detecting performance towards aromatic ring compounds, such as 2,4,6-trinitrotoluene, TNT, which have strong π-π interaction with the MoS 2 -PABSA sensing platform. The detailed electrochemical characterization of MoS 2 -PABSA showed the influence of electropolymerization cycles and pH values on detection of TNT. Under the optimum condition, highly sensitive detection for TNT was realized with the limit of detection of 0.043 ppb (0.187 nmol L − 1 ) and a linear range of 0.1–200 ppb. This research proves that the MoS 2 -PABSA was a worthy electrochemical sensing platform for further simple and sensitive detection of some other aromatic ring compounds.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Bing Zheng,Yan Li,Furong Tao,Yuezhi Cui,Tianduo Li
Carbazole-based linear conjugated polymer (P 1 ) and hyperbranched conjugated polymer (P 2 ), were successfully synthesized with high molecular weights and good solubilities through Sonogashira coupling reactions. Compared with P 1 , the charactyeristics of P 2 were remarkably changed by exhibiting outstanding thermal stabilities and different emission behaviors. In this work, a superquenching effect was observed in the TNT-detection process by using P 2. The calculated Stern-Volmer quenching constant revealed that P 2 was more sensitive than P 1 towards TNT in solution, owing to the hyperbranched structure of P 2 had multiple exciton migration channels and diffusion pathways via numerous branches in the two-dimensional (2D) space. Simultaneously, quenching efficiency of P 2 was higher than that of P 1 , due to hyperbranched structure of P 2 had multiple exciton migration channels.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2018
·Vol. 9
·期 30
·4150-4160
·
IF 4.927
Qian Li,Xiao Li,Zhongying Wu,Yuhao Sun,Jianglin Fang,Dongzhong Chen
Tetraphenylethylene (TPE) is one of the well-known typical aggregation-induced emission (AIE) luminogens (AIEgens) and TPE-containing polymers possess excellent processing properties which facilitates the fabrication of various AIE systems and devices. For AIE active side-chain polymers, increasing the fluorescence quantum yield through suitable molecular design is very appealing. In this work, we present the well-controlled synthesis of a series of TPE polyacrylate side-chain polymers of Pm with short spacers with methylene number m = 0–5 via RAFT polymerization. All the obtained polymers exhibit typical and strong AIE characteristics in THF/H2O solution mixtures and in solid state films. In particular, greatly enhanced fluorescence emission is achieved with reduced spacer lengths, and further significant improvement achieved through annealing, which is ascribed to the restriction of intramolecular motions (RIM) and the blocking of the non-radiative channels due to overcrowding and confinement thanks to the strong positive coupling effect and the jacketing effect of side-chain polymers with very short spacers. The quantum yields of 34.4%, 32.0% and 31.4%, respectively, for the polymer films P0, P1 and P2 are several times higher than those of homologous polymers with longer spacers reported in the literature. Based on these TPE side-chain polymers of very short spacers, a simple, economic and visual method for detection of the explosive 2,4,6-trinitrotoluene (TNT) is demonstrated. Therefore, a facile approach and feasible strategy of simply adopting very short spacers for side-chain AIE active polymer preparation to significantly enhance the luminescence efficiency has been properly established and proposed, which may provide guidance and have a wealth of implications for the rational design and preparation of highly efficient luminescent AIE polymer materials.
研究领域:
材料科学
·
高分子化学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2013
·
IF 2.144
Lijuan Feng,Cuiyan Tong,Yao He,Bingxin Liu,Chunyu Wang,Jie Sha,Changli Lü
A new fluorescent sensor based on single water-soluble β-cyclodextrin (β-CD) molecule as the support carrier of donor and acceptor complex was designed, and used for TNT detection by fluorescence resonance energy transfer (FRET). In this sensing platform, per-6-amino-β-CD (per-6-NH 2 -β-CD) was used as the detection vehicle. The probe dye of fluorescein 5(6)-isothiocyanate (FITC) was covalently linked onto the per-6-NH 2 -β-CD rim with the grafting molar ratio of 1:1, the residual amino groups of per-6-NH 2 -β-CD can adsorb TNT molecules by forming Meisenheimer complex (TNT–amine complex) with TNT. The absorbtion spectrum of this complex has a spectral overlapping with the emission of FITC in aqueous solution, so it can strongly suppress the fluorescence emission of the adjacent FITC through FRET on β-CD vehicle. This FRET-based fluorescent sensing technique provides a facile, ultrasensitive and selective detection method for TNT molecule. The observed linear fluorescence intensity change could allow the quantitative detection TNT with the detection limit of 20 nM in water.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 120
·98724-98729
·
IF 3.84
Yahui Guo,Xiongtao Wang,Bin Miao,Ying Li,Weirong Yao,Yunfei Xie,Jiadong Li,Dongmin Wu,Renjun Pei
Herein, an ultrasensitive sensor based on a AlGaN/GaN high electron mobility transistor (HEMT) was developed for the detection of 2,4,6-trinitrotoluene (TNT). The sensing surface of the AlGaN/GaN HEMT grid was covalently bonded with a layer of gold nanoparticles which were functionalized with cysteamine for specific electrostatic interaction with TNT. The binding of TNT to cysteamine through donor–acceptor interactions could affect the surface charge on the gate area of the AlGaN/GaN HEMT, resulting in a gate voltage change and density changes of the 2-dimensional electron gas (2EDG) at the interface of AlGaN/GaN. By the merit of the high electron mobility of the AlGaN/GaN transistor and robust binding between cysteamine and TNT, the sensor demonstrated a fast response and excellent performance with quantitative ranges at ppt levels (from 0.1 ppt to 10 ppb) with good selectivity towards TNT. This HEMT sensor showed attractive properties for TNT detection in terms of speed, sensitivity and miniaturization.
研究领域:
材料科学
·
传感器技术
·
爆炸物检测
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2013
·
IF 5.437
Minmin Liu,Wei Chen
Sensitive and selective detection of 2,4,6-trinitrotoluene (TNT) has attracted considerable attention due to the wide applications of TNT as explosive material . Many efforts have been made to develop various sensors for detecting TNT in recent years. We herein report a novel sensor based on p-aminothiophenol (PATP) functionalized silver nanoparticles supported on graphene nanosheets (Ag/GNs), which was found to be a kind of effective chemosensor for the ultratrace detection of TNT by using surface enhanced Raman scattering (SERS). In the present hybrid material, PATP is paired together to form a corresponding azo compound p, p′-dimercaptoazobenzene (DMAB) and thus can be used as a model Raman probe. The π-donor–acceptor interaction between π-acceptor TNT and π-donor DMAB-Ag/GNs complex can effectively induce the “hot spots” for SERS. The intense spectral resonance from the DMAB–TNT–DMAB bridges formed between the Ag/GNs nanosheets could result in enhanced Raman signals of DMAB molecules with the presence of ultratrace TNT. SERS measurements demonstrated that TNT with concentration as low as 10 −11 M can be detected by using the present SERS platform. The present study not only provides a facile method for ultrasensitive and selective detection of TNT but also could develop a graphene-based SERS platform.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xin Ran,Qing Qu,Xingcan Qian,Wei Xie,Shunling Li,Lei Li,Long Yang
By combining the merits of water-soluble pillar[6]arenes (WP6s) and nitrogen-doped carbon quantum dots (N-CQDs), a sensitive electrochemical sensing platform was constructed by using the WP6-N-CQD nanocomposites as an electrode material for the detection of trinitrotoluene (TNT). N-CQDs were prepared via microwave route by using urea and citric acid as raw materials. Two kinds of macrocyclic hosts, β-CD and WP6, were incorporated on to the N-CQDs via hydrogen bonding and π − π interactions, respectively. The FTIR, TGA, and XPS characterizitions demonstrated that the β-CD-N-CQD and WP6-N-CQD composites were successfully prepared. The WP6-N-CQD-modified glass carbon electrode (GCE) indicated an enhanced electrochemical signal than the β-CD-N-CQDs/GCE in the reduction of 2,4,6-trinitrotoluene (TNT), which was attributed to the higher supramolecular recognition capability of the WP6 host than that of β-CD towards TNT. The linear ranges of 0.001 μM–1.0 μM and 1.0 μM–20.0 μM were obtained by using this electrochemical sensing platform. The detection limit was 0.95 nM (S/N = 3). The developed electrochemical sensing technique was successfully applied for the detection of TNT in lake water samples. Therefore, WP6-N-CQD nanocomposites are promising for the construction of high performance electrochemical sensors for the detection of explosives.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Yanan Sun,Yuwei Wu,Chaoran Yu,Li Zhang,Gang Song,Zhiyi Yao
We report nanoscale pyrenyl excimers induced by the self-assembly of a pyrene-based fluorescent probe, 12-pyren-1-yldodecanoic acid (PyDA), for rapid detection of 2,4,6-trinitrotoluene (TNT) in aqueous media. Under the optimized conditions, the sensing nanosystem exhibited fast response and high selectivity and sensitivity for the detection of TNT. Especially, it could distinguish TNT from TNP, which is the major interferent in most circumstances. The detection limit is as low as 5.0 × 10–9 M. It also can be used for qualitatively and quantitatively monitoring TNT in real samples.
研究领域:
纳米技术
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 12
·9598-9605
·
IF 3.201
Yajiao Song,Haichao Duan,Siyao Zhu,Jianhua Lü,Changli Lü
Novel temperature-responsive block copolymer-functionalized graphene oxide (GO) nanosheets were successfully prepared via non-covalent π–π stacking interactions between GO and pyrene-terminated PNIPAM-b-P(OEGMA-co-MQ). The pyrene-terminated block copolymer was synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization using a pyrene functional RAFT agent and the monomers N-isopropylacrylamide (NIPAM), oligo(ethylene glycol) monomethyl ether methacrylate (OEGMA) and 5-(2-methacryloyl-ethyloxymethyl)-8-quinolinol (MQ). ZnS nanoparticles were also integrated into the block copolymer-decorated GO via the coordination of MQ units of the block copolymers to fabricate a fluorescent nanocomposite with good temperature-responsive behavior based on a conformation change in the PNIPAM blocks on the GO sheets. The as-prepared block copolymer anchored graphene oxide@ZnS NPs nanocomposite can be used as a fluorescent sensing platform for sensitive and selective detection of nitroaromatic explosive 2,4,6-trinitrotoluene (TNT) with a detection limit of 4.4 nM via a fluorescence resonance energy transfer (FRET) process.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）