Chemical Science
·
2015
·Vol. 6
·期 8
·4445-4450
·
IF 9.211
Peng Wu,Chaoying Xu,Xiandeng Hou,Jing-Juan Xu,Hong-Yuan Chen
Fingerprints are a unique characteristic of an individual. Recently, it has been realized that fingerprints carry more information about individuals than just their identity, for example, they may identify potential addicts and terrorists carrying explosives. Therefore, the development of imaging moieties capable of both fingerprint staining and drug/explosive visualization is of significant importance for forensic chemistry. Here we developed a nanohybrid comprising green- and red-emitting QDs for simultaneous fingerprint imaging and TNT visualization in fingerprints. The red-emitting Cu-doped ZnCdS (Cu–ZnCdS) QDs were embedded into silica nanoparticles and the green-emitting ZnCdS QDs were anchored onto the surface of the silica nanoparticles and further functionalized with polyallylamine (PAA). Both components of the nanohybrid, i.e., the PAA-functionalized green QDs and red QD-doped silica nanoparticles, could be explored for fingerprint imaging. Due to the formation of a Meisenheimer complex between TNT and PAA, the green-emitting QDs could be quenched by TNT, meanwhile the red-emitting QDs were inert. Therefore, the nanohybrid exhibited a traffic light-type fluorescence color change (green-yellow-red) to TNT concentration in the range of 40–400 μM. This method is promising for potential applications in security-screening needs in public areas such as airports and train stations.
研究领域:
法医学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2013
·
IF 3.532
Haixia Zhang,Lijuan Feng,Bingxin Liu,Cuiyan Tong,Changli Lü
This paper reported a convenient method to prepare water-soluble graphene oxide (GO) functionalized by amine-modified mesoporous silica nanoparticles (MSNs) containing poly(p-phenylenevinylene) via covalent bonds . The resulted GO–PPV@MSN hybrid materials had a good dispersion and strong green fluorescence in aqueous solution. The structure, morphology and optical properties of the resulting hybrid materials were characterized. The GO-PPV@MSN can be used as a novel and effective fluorescent sensing platform for detection of 2,4,6-trinitrotoluene (TNT) in aqueous solution by fluorescence resonance energy transfer (FRET). Upon the addition of TNT, the amino groups on the surface of PPV@MSN can bind TNT molecules from solution by forming Meisenheimer complex, and this complex can absorb the green part of visible light, and strongly suppress the fluorescence emission of GO-PPV@MSN through FRET. The observed linear fluorescence intensity change allowed the quantitative detection of TNT with a detection limit down to 1.3 × 10 −7 M.
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
·
2025
·
IF 7.7
Piaotong Liu,Jialong Guo,Xin Li,Weize Shi,Yabin Wang,Xiaoliang Wang,Yang Liu
Detecting explosives is crucial for ensuring global public safety, enhancing counter-terrorism measures, and safeguarding the environment. Traditional detection methods struggle in high-traffic areas like airports and train stations, where portable systems must quickly and accurately detect targets amid dense crowds and strict security demands. Fluorescent film-based sensing technologies offer a promising solution in detecting trace explosive vapors. However, gas-phase detection with fluorescent films faces challenges in achieving stable and controllable detection due to the multi-step process involved, such as film preparation, gas transport, and optoelectronic conversion. In this study, we introduce an integrated film-based fluorescent sensor system that employs a microchannel structure to detect TNT vapor. Fluorescent microchannels are created by spin-coating a modified polystyrene polymer within a glass capillary tube. A sample collection module employing nylon test paper collects TNT samples, which are then heated within a compact gasification chamber before detection. The fluorescent microchannels are excited by ultraviolet light, and the emitted signals are detected perpendicularly to the excitation source. The optical and gas flow paths are arranged orthogonally, contributing to the system's portability and stability. The film-based sensor exhibits high sensitivity, with a detection limit of 0.01 ng/μL (liquid-phase), corresponding to a gas-phase concentration of approximately 1.2 ppb. The system achieves a rapid signal response time within 3 s and completes the detection process in under 60 s, while maintaining high selectivity and reusability.
研究领域:
传感器与生物传感器
·
分析化学
·
爆炸物检测
·
微流控技术
·
光学传感
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Chi Zhong,Ziqi Wu,Yangqing Mao,Bing Zhao,Yi Sun,Min Zheng,Mingru Zhou,Guanjun Chang,Yewei Xu
A novel donor–acceptor–donor (D–A–D) polymer, named poly(triphenylamine sulfone) (PTPAS), incorporating a triphenylamine group as the donor and a sulfone group as the acceptor, has been designed and synthesized. PTPAS was efficiently prepared using readily available materials through a catalyst-free C–N coupling reaction, demonstrating its suitability for large-scale industrial production. PTPAS exhibited remarkable thermal performance and demonstrated dual-state emission (DSE) characteristics, with fluorescence quantum yields of 0.58 in tetrahydrofuran solution, 0.27 in 99% aqueous solution, and 0.09 in the solid state. Moreover, PTPAS displayed exceptional fluorescence detection capabilities for TNT, exhibiting a high Stern–Volmer quenching constant (KSV) of 2.98 × 105 M−1, a low limit of detection (LOD) of 94 nM, and a rapid response time of 15 s. Crucially, PTPAS maintained excellent fluorescence performance and TNT detection characteristics across an exceptionally broad pH range from 1 to 13, showcasing its versatility. Additionally, PTPAS exhibited robust resistance to interference from cations, anions, and other nitro-based explosives.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·
IF 4.7
Mao Yangqing,Zhu Haoran,Zhang Boyuan,Wu Ziqi,Zhao Bing,Yuan Rui,Zhou Mingru,Zheng Min,Chang Guanjun,Xu Yewei
A strategy driven and induced by cation-π interaction was employed to obtain a magnetic porous composite material (Fe 3 O 4 /PIN) with a uniform dispersion of ferroferric oxide (Fe 3 O 4 ). Utilizing ferric chloride as the catalyst, indole-based porous polymer (PIN) was successfully synthesized through the Friedel-Crafts alkylation reaction. Concurrently with the preparation of the PIN, the cation-π interaction played a pivotal role, not only driving but also inducing the effective dispersion of iron ions from the catalyst around the indole groups. Subsequently, the introduction of ferrous sulfate into the reaction mixture triggered an in-situ reaction, resulting in the uniform distribution of Fe 3 O 4 around the indole groups within the PIN. At a temperature of 298 K, Fe 3 O 4 /PIN demonstrated remarkable adsorption efficiency for TNT, boasting a maximum adsorption capacity of 290.697 mg/g, with the ability to achieve 74% of this capacity within one hour. Moreover, Fe 3 O 4 /PIN also exhibited a commendable adsorption efficiency for TNT in real water samples. In addition, Fe 3 O 4 /PIN could be recovered rapidly due to its excellent magnetic properties. After five adsorption-desorption cycles, the adsorption capacity of Fe 3 O 4 /PIN for TNT remained at 90% of its maximum capacity. Hence, Fe 3 O 4 /PIN was anticipated to serve as an effective adsorbent for TNT. The uniform distribution of Fe 3 O 4 in porous materials through the driving and inducing effects of cation-π is an unprecedented innovation, offering a new perspective and approach to the synthesis and utilization of similar composite materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
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
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
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
Materials Chemistry Frontiers
·
2018
·Vol. 3
·期 2
·193-198
·
IF 0
Tao Hu,Wen Sang,Ke Chen,Hongxi Gu,Zhonghua Ni,Shaoqin Liu
Rapid and selective detection of trace levels of nitroaromatic explosives, in particular, 2,4,6-trinitrotoluene (TNT), is a key challenge for both public security and environmental monitoring. In the present study, we fabricated two colored quantum dot (QD) multilayer-decorated microchannel assays via a layer-by-layer assembly technique. Due to the energy transfer between red QDs and green QDs, the fluorescence intensity of the red QDs significantly enhanced. When the assays were exposed to TNT aqueous solution, the formation of Meisenheimer complexes between the electron-poor aromatic groups of TNT and electron-rich amines on the surface of the red QDs caused fluorescence quenching of the red QDs and partial recovery of the green QDs, thus resulting in multicolor changes of the multilayers from red to yellow to green and then to colorless. The assay has a broad linear range of 10 ppt to 107 ppt and low detection limit (5.24 ppt) for TNT. The specificity of this assay for the detection of TNT is demonstrated against several TNT analogs. Additionally, this technique was successfully applied to detect TNT concentration in different water samples. Due to its simplicity, short detection time, high sensitivity and low cost, the assay is well suited for the detection of ultratrace levels of TNT.
研究领域:
分析化学
·
环境科学
·
材料科学
·
公共安全
✓ 已验证
产品关联
DOI
FOOD RESEARCH INTERNATIONAL
·
2024
·
IF 7
Huan Zhang,Shuting Huang,Yali Zhao,Hong Sabrina Tian,Mengshi Lin,Yunfei Xie,Zhilong Yu
Active packaging technologies are evolving to enhance the preservation of fresh produce by fighting against microbial contamination and controlling internal packaging atmospheres. This study introduced an active fruit packaging called MT film, created by modifying a microporous polyvinyl alcohol/chitosan/cellulose nanocrystal bionanocomposite film with CuO-doped titania nanotubes. The MT film, with an average micropore size of 2.4 μm, displayed excellent mechanical properties and hydrophobicity due to its crosslinked structure. When exposed to visible light, the MT film could produce reactive oxygen species, effectively inhibiting the growth of Staphylococcus aureus and Escherichia coli O157:H7. Moreover, experiments on blueberry preservation demonstrated that the MT film could remove excess CO 2 and maintain a higher O 2 level. Under visible light, this film significantly reduced total viable count (4.6 ± 0.2 log CFU/g) and mold colony count (2.6 ± 0.1 log CFU/g), with Bacillus and Ascochyta being the primary inhibited genera. These findings highlight the potential of MT film in utilizing visible light to prevent microbial growth on blueberries and regulating the gas exchange of food packaging. MT film holds promise as an active packaging solution to improve the quality and shelf life of fresh produce while reducing food losses in the supply chain.
研究领域:
食品科学
·
包装技术
·
材料科学
·
微生物学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2014
·Vol. 20
·期 16
·4829-4835
·
IF 5.696
Wenjing Qi,Min Xu,Lei Pang,Zhongyuan Liu,Wei Zhang,Saadat Majeed,Guobao Xu
Graphical An explosive situation : Methods for the electrochemiluminescence (ECL)-based detection of 2,4,6-trinitrotoluene (TNT) through the formation of a TNT–amine complex and through ECL resonance energy transfer have been developed (see figure). The determination of TNT concentration with 3-aminopropyltriethoxysilane (APTES)-modified [Ru(phen) 3 ] 2+ (phen=1,10-phenanthroline)-doped silica nanoparticles (RuSiNPs) down to 1 n M is achieved within 1 min. 2,4,6-Trinitrotoluene (TNT) is a widely used nitroaromatic explosive with significant detrimental effects on the environment and human health. Its detection is of great importance. In this study, both electrochemiluminescence (ECL)-based detection of TNT through the formation of a TNT–amine complex and the detection of TNT through electrochemiluminescence resonance energy transfer (ECRET) are developed for the first time. 3-Aminopropyltriethoxysilane (APTES)-modified [Ru(phen) 3 ] 2+ (phen=1,10-phenanthroline)-doped silica nanoparticles (RuSiNPs) with uniform sizes of (73±3) nm were synthesized. TNT can interact with APTES-modified RuSiNPs through charge transfer from electron-rich amines in the RuSiNPs to the electron-deficient aromatic ring of TNT to form a red TNT–amine complex. The absorption spectrum of this complex overlaps with the ECL spectrum of the APTES-modified RuSiNPs/triethylamine system. As a result, ECL signals of the APTES-modified RuSiNPs/triethylamine system are turned off in the presence of TNT owing to resonance energy transfer from electrochemically excited RuSiNPs to the TNT–amine complex. This ECRET method has been successfully applied for the sensitive determination of TNT with a linear range from 1×10 −9 to 1×10 −6 M with a fast response time within 1 min. The limit of detection is 0.3 n M . The method exhibits good selectivity towards 2,4-dinitrotoluene, p -nitrotoluene, nitrobenzene, phenol, p -quinone, 8-hydroxyquinoline, p -phenylenediamine, K 3 [Fe(CN) 6 ], Fe 3+ , NO 3 − , NO 2 − , Cr 3+ , Fe 2+ , Pb 2+ , SO 3 2− , formaldehyde, oxalate, proline, and glycine.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiao-Shuang Ma,Dong-Hao Wang,Yue-Zhi Cui,Fu-Rong Tao,Yong-Tao Wang,Tian-Duo Li
A novel hydrophilic polymer based on hydroxyl group grafted onto the side chain of polymer was successfully synthesized. Due to the hydrophilic of hydroxyl groups, the hydrophilic polymer overcame the drawback of fluorescent conjugated polymer insoluble in water. Polymer chains evenly distributed in aqueous solution and possessed the signal amplification effect in the aqueous phase. The hydroxyl groups in polymer could effectively absorb nitroaromatics (NACs) by hydrogen bonding interaction between NACs and hydroxyl groups. When the TNT and DNT concentration was 1.08 × 10 −4 mol/L and 1.44 × 10 −4 mol/L respectively, the quenching efficiency ( η EP ) of polymer reached 93% and 91%. The limit of detection of the polymer to DNT and TNT solution are 7.4 × 10 −7 mol/L and 1.1 × 10 −6 mol/L, respectively. Fluorescence quenching studies demonstrated that the hydrophilic polymer was highly sensitive towards NACs. Moreover, the excellent property of selectivity indicated the hydrophilic polymer might be a promising sensor in the monitoring field of the underwater hidden explosives and water environmental quality.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）