CHEMICAL PAPERS
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2025
·
IF 2.5
Kong Yucheng,Liu Xuyang,Jiang Wenjuan,Li Xiaochuan
A photochromic dye ( TPDA ) with helical structure was configured by attaching triangle terthiophene to triphenylamine units. It exhibits typical photochromic behavior when irradiated with UV (390 nm)/visible light (> 410 nm). Moreover, TPDA in tetrahydrofuran (THF) can be switched alternately between color and colorless state. In addition, it exhibits highly emissive character in THF and could emit bright blue fluorescence by UV irradiation. And the fluorescence emission efficiency was estimated to be 0.41. Under the UV light irradiation, a ring-closure reaction occurred and the blue fluorescence was quenched effectively at the same time. At photo-stationary state, the quantum yield was lowered to 0.10. Therefore, a switch controllable fluorescence “on–off” molecular system was developed when light irradiation cycle established (UV/visible light). Optimization of the dye structure was performed using density functional theory at the DND/B3LYP level of theory. The structural analysis reveals that the shorter distance between reactive atoms (< 4.2 Å) in the triangle terthiophene unit promotes the smoothly photochromism of TPDA .
研究领域:
有机化学
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材料科学
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光化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Yang Yu,Sai Xu,Yuefeng Gao,Muhan Jiang,Jinsu Zhang,Xiangping Li,Xizhen Zhang,Baojiu Chen
The development of upconversion nanoparticles based logic systems, especially integrated logic systems is still a challenge until now. In this work, an upconversion nanocomposite system is developed and studied for the sensing abilities toward hydrion, hydroxyl ions , metal ions and anions (S 2 − , I − ) by taking the advantages of turn-on and turn-off upconversion fluorescence switching response. Triggering by different kinds of ions, the upconversion system can act as a fluorescence switch due to the specific recognition abilities of Rhodamine 6G functionalized PEI for specific ions and the energy transfer process from upconversion nanoparticles to recognition molecules. Based on these results, multiple molecular logic gates , including single-input logic operation (YES, NOT), double-inputs logic operation (OR, AND, NOR, INHIBIT) and multiple-input integrative logic operation (INHIBIT+OR) are developed by employing hydrion, hydroxyl ions, metal ions and anions as inputs and the changes in the upconversion fluorescence intensity as output. The multiple logic operations are of great significance for the applications in biomedicine and molecular calculation.
研究领域:
生物医学
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纳米技术
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化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Mengmeng Qin,Yuxiao Xu,H. Gao,Guoying Han,Rong Cao,Peili Guo,Wei Feng,Li Chen
Aggregation-induced emission (AIE) materials present unique solid-state fluorescence. However, there remains a challenge in the switching of fluorescence quenching/emitting of AIE materials, limiting the application in information encryption. Herein, we report a composite of tetraphenylethylene@graphene oxide (TPE@GO) with switchable microstructure and fluorescence. We choose GO as a fluorescence quencher to control the fluorescence of TPE by controlling the aggregation structure. First, TPE coating with an average thickness of about 31 nm was deposited at the GO layer surface, which is the critical thickness at which the fluorescence can be largely quenched because of the fluorescence resonance energy transfer. After spraying a mixed solvent (good and poor solvents of TPE) on TPE@GO, a blue fluorescence of TPE was emitted during the drying process. During the treatment of mixed solvents, the planar TPE coating was dissolved in THF first and then the TPE molecules aggregated into nanoparticles (an average diameter of 65 nm) in H2O during the volatilization of THF. We found that the fluorescence switching of the composite is closely related to the microstructural change of TPE between planar and granular structures, which can make the upper TPE molecules in and out of the effective quenching region of GO. This composite, along with the treatment method, was used as an invisible ink in repeated information encryption and decryption. Our work not only provides a simple strategy to switch the fluorescence of solid-state fluorescent materials but also demonstrates the potential for obtaining diverse material structures through compound solvent treatment.
研究领域:
材料科学
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光学
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化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 4
·3224-3230
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IF 3.84
Yang Zheng,Changming Chen,Yunlong Gu,Jihou Wang,Shouzhuo Yang,Xu Fei,Xibin Wang,Yunji Yi,Xiaoqiang Sun,Fei Wang,Daming Zhang
In this study, a metal-cladding directly defined active waveguide technique is proposed. Optical waveguide amplifiers and thermo-optic (TO) waveguide switches based on erbium-containing polymer are designed and fabricated using this technique. The Er organic complexes containing polymeric reactivity groups are synthesized and investigated by free radical copolymerization. Optical characteristics and thermal stabilities of the active polymer are analyzed. Relative optical gain of the amplifier at 1530 nm is obtained as 3.6 dB. The rise and fall response time of the TO switch applied by 300 Hz square-wave voltage is measured as 511.7 μs and 341.5 μs, respectively. The power-time product is 12.5 mW ms and the extinction ratio is about 20 dB. The technique is very suitable for realizing large-scale optoelectronic integrated circuits.
研究领域:
光学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jing Yang,Tingting Wang,Ran Guo,Decui Yao,Weiwei Guo,Shuo Liu,Zhiqiang Li,Yige Wang,Huanrong Li
Luminescent materials with dynamic responsiveness to external stimuli have attracted extensive attention for the development of advanced sensors and smart materials; however, self-healing capability is also of great importance for functional soft materials. An acid/base vapor reversibly triggered luminescence switch with self-healing ability is achieved by incorporating dynamic lanthanide metal–ligand (Ln–L) coordination into the soft polydimethylsiloxane polymer network. The emission color of the resultant luminescent material could be modulated by altering either the Eu3+/Tb3+ molar ratio or the excitation wavelength. The luminescence “On–Off” reversible switch is realized via direct alternating exposure to acid and base vapor, realizing reversible information encryption and decryption. The dynamic Ln–L cross-link as well as the hydrogen bond in the luminescent material endow it with excellent self-healing capability, high toughness, and stretchability. We believe this acid/base vapor-triggered self-healing switching strategy provides new insights for expanding the application range of luminescent materials.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
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2017
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IF 4.396
Fengjin Qu,Xiaoyan Ma,Lin Zhu,Fang Chen
A new photoswitchable electrode triggered by a brief light signal was fabricated by depositing an azobenzene-containing copolymer on an indium tin oxide substrate decorated with gold nanoparticles . The polymer formed a compact, complete thin film on the electrode surface using the Langmuir–Schaefer technique and offered reversible and stable switching performance. The conductivity and hydrophilicity of the electrode changed under UV/visible light due to the photoisomerization of the azobenzene moieties in the polymer film, influencing electron transfer and mass transport at the electrode. The electrochemical characterization demonstrated that the electrode exhibited reversibly switchable electrochemical behavior. In its active state, the as-prepared electrode possessed efficient electrocatalytic capability towards uric acid oxidation with a maximum anodic current density of 0.97 mA·cm − 2 . The uric acid/air fuel cell assembled from the photo-triggered anode and a Pt/C-modified cathode operated with an open circuit voltage of 0.12 V and a maximum power density of 41.33 μW·cm − 2 . The cell exhibited reversible switching performance (four cycles) and high stability: after one month the power output was 94.2% of the original maximum value.
研究领域:
生物化学
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材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2019
·Vol. 29
·期 4
·819-825
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IF 1.913
Xu Yin-long,Bai Rong-biao,Qi Cai-yu,Ren Zeng,Jia Xiu-zhi,Kan Zi-gui,Li Cao-long,Wang Fei
Herein, a simple and efficient fluorescence analysis method for L-Cysteine (L-Cys) was established. The method was based on the fluorescent “off-on” mode of nitrogen doped carbon dots (NCDs). The NCDs were prepared via a facile one-step solvothermal method. In the process of exploring the bio-functional application of these newly synthesized NCDs, we found these NCDs with rich functional groups exhibited excellent optical properties. In addition, these newly synthesized NCDs showed an excitation-dependent emissions photolumine-scent (PL) property and exhibited good performance in the detection of Fe 3+ ions by quenching the blue emission fluorescence. Interestingly, the quenched fluorescence of NCDs was recovered with the addition of L-Cys, which provided a novel approach for L-Cys detection. The NCDs-based fluorescent “off-on” sensor has a wide linear detection range (0–100 μM), and a relatively low detection limits (0.35 μ M) for L-Cys. This simple fluorescent “off-on” approach is, very sensitive and selective for L-Cys detection, which also provides a new insight on NCDs biosensor application.
研究领域:
分析化学
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生物传感
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医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Yi Pan,Yupeng Shi,Zhihua Chen,Junying Chen,Mengfei Hou,Zhanpeng Chen,Cheuk-Wing Li,Changqing Yi
In this study, two new functionalized polyethylenimine (PEI), PEIR and PEIQ, have been synthesized by covalently conjugating rhodamine 6G (R6G) or 8-chloroacetyl-aminoquinoline (CAAQ) and have been investigated for their sensing capabilities toward metal ions and anions basing on fluorescence on–off and off–on mechanisms. When triggered by protons, metal ions, or anions, functionalized PEIs can behave as a fluorescence switch, leading to a multiaddressable system. Inspired by these results, functionalized PEI-based logic systems capable of performing elementary logic operations (YES, NOT, NOR, and INHIBIT) and integrative logic operations (OR + INHIBIT) have been constructed by observing the change in the fluorescence with varying the chemical inputs such as protons, metal ions, and anions. Due to its characteristics, such as high sensitivity and fast response, developing functionalized PEI as a new material to perform logic operations may pave a new avenue to construct the next generation of molecular devices with better applicability for biomedical research.
研究领域:
生物化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
·
IF 5.141
Qiusha Li,Shuzhen Peng,Yun Chang,Mujing Yang,Dandan Wang,Xiaoshun Zhou,Yong Shao
G-triplex (G3), as an intermediate of G-quardruplex (G4), is a typical non-classical DNA topology with three G-tracts, formed by folding guanine-riched DNA sequences. The flexibility and tunability of G3-folding structures can provide a versatile platform for analytes sensing. However, current researches about G3s on sensing applications, especially on metal ion sensing, are relatively rare. Herein, we first develop a label-free fluorescence switch-on sensing platform based on the G-triplex topology (HtG3) for the specific qualitative identification of chromium species. Coralyne (COR), a molecule probe whose fluorescence can be inhibited by HtG3, is employed to monitor the Cr 3+ binding events with the principle that Cr 3+ could break the parallel HtG3-folding structure to result in COR releasing from HtG3 and its fluorescence recovery. Furthermore, this HtG3 sensing platform we constructed also can be used to indirectly identify CrO 4 2- through reducing it to Cr 3+ with ascorbic acid (AA). Our work will extend the practical application of G3 as a biosensor and inspire wide interests in exploring more non-classical DNA structures.
研究领域:
分析化学
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生物传感器
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 28
·13766-13773
·
IF 3.925
Hao Lin,Zhiyuan Cheng,Dekang Xu,Xuegang Zheng,Tong Liu,Liqin Xu,Ying Ma,Yueli Zhang
The development of a NIR-II (near-infrared-II: 1000–1700 nm) nanophotoswitch is urgently needed, due to its deeper tissue penetration and higher resolution imaging. In this work, a new type of NIR-II upconversion (UC) and downconversion (DC) nanophotoswitch (NaErF4:Ho@NaYF4@NaYbF4:Tm@NaYF4 core–multishell nanoparticles) is presented. When the switch is open, ultraviolet (UV)–blue emissions and intense red UC (Er3+:654 nm) and NIR-II DC (Er3+:1520 nm) emissions are simultaneously obtained under 980 nm NIR-I (near-infrared-I: 700–1000 nm) excitation, which shows potential application for real-time visible- and NIR-II-imaging in the photodynamic therapy (PDT) process. When the switch is closed, UV–blue emissions disappear while red UC (Er3+:654 nm) and NIR-II UC (Ho3+:1154 nm) emissions remain under 1532 nm NIR-II excitation, which may be used for real-time visible- and NIR-II-imaging before conducting PDT. This novel NIR-II nanophotoswitch displays special advantages in the biomedical field.
研究领域:
生物医学工程
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材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Xuanping Tan,Yuhui Zhang,Huaping Mao,Jidong Yang
In this work, specific aptamers with affinity for S-propranolol were screened by SELEX technology based on the graphene oxide (GO) adsorption platform, and a GO-FAM labeled aptamer-propranolol fluorescent optical switch system was constructed for the recognition of chiral propranolol. It was found that the fluorescence quenching of FAM labeled aptamer could be caused by the adsorption of GO. However, when S-propranolol was introduced, S-propranolol could pull out the aptamer adsorbed by GO, and the fluorescence of the system could be restored. But, R-propranolol could not be realized. Therefore, a simple and sensitive fluorescent optical switch system was established to identify chiral propranolol and perform highly sensitive detection of S-propranolol.
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 56
·29479-29484
·
IF 3.708
Xuejuan Wan,Tianqi Liu,Haiyang Liu,Liqiang Gu,Youwei Yao
A new rhodamine B-based fluorescent probe was developed for the selective cascade signaling of trivalent cations (Fe3+, Al3+, Cr3+) and phosphate anion (PO43−). Non-fluorescent rhodamine derivatives can selectively detect trivalent cations over some other metal ions in CH3CN–Tris buffer (1/1, v/v, pH 7.0) solutions, leading to prominent fluorescence OFF–ON switching. The obtained probe–cation complex can subsequently serve as a sensitive and selective chemosensor for PO43−, exhibiting complete signal quenching (fluorescence ON–OFF switching).
研究领域:
分析化学
·
生物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）