TALANTA
·
2021
·
IF 6.057
Yulu Liu,Lei Cao,Minghui Zan,Jiahui Peng,Panyong Wang,Xinpei Pang,Yan Zhang,Li Li,Wen-Fei Dong,Qian Mei
As an important bioactive component in plants, chlorogenic acid (CGA) has been widely studied for its potential role in human health. In this work, cyan fluorescent silicon quantum dots were successfully synthesized via a simple one-pot method for the rapid detection of CGA. The optimal excitation and emission wavelength of the obtained SiQDs was 350 nm and 470 nm, respectively. When the CGA was added, the maximum emission intensity of the SiQDs can be effectively quenched due to dynamic and static mixed quenching mechanisms. More significantly, there was a remarkable linear correlation between fluorescence quenching efficiency and a broad concentration of CGA solution range from 10 to 150 μmol/L with a limit of detection (LOD) of 0.43 μmol/L. Furthermore, the proposed SiQDs were successfully applied to analyze CGA in coffee beans and instant coffee after simple pretreatment with satisfactory results. Based on these, a high sensitivity and excellent selectivity fluorescent probe detection system was constructed, and it provides a valuable platform for the detection of CGA and has broad application prospects in the biological and pharmaceutical analysis field.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Current Analytical Chemistry
·
2019
·Vol. 15
·期 5
·560-566
·
IF 1.242
Zhang Zhixia,Zhao Dan,Pang Yonghao,Hao Jian,Xiao Xincai,Hu Yan
Background: Formaldehyde is widely acknowledged as a carcinogen, but as an important organic reagent, it has also been widely employed in the fields of chemical synthesis, industrial production and biomedicine. It is therefore of great practical significance for the detection of formaldehyde
in food, clothing, daily necessities, construction materials and environments. Methods: The two silicon QDs, that are, DAMO-Si-QDs (with N-[3-(Trimethoxysilyl) propyl] ethylenediamine as silicon source) and APTMS-Si-QDs (with (3-Aminopropyl) trimethoxysilane as silicon source) as the
fluorescence probe to detect formaldehyde in both water and organic phases. Results: Silicon QDs prepared by different silicon sources exhibit an obvious difference in their tolerances to the environment and the responses to formaldehyde. However, APTMS-Si-QDs show better selectivity
in both water and organic phases. In Tris-HCl solution (20.00mmol•L-1, pH=5), the formaldehyde concentration maintains an excellent linear relationship with the fluorescence intensity of APTMS-Si-QDs in the range of 3.1250-7-3.1250-5 mol•L-1, with correlation coefficient R2= 0.9998.
In methanol, the formaldehyde concentration maintains an excellent linear relationship with the fluorescence intensity of APTMS-Si-QDs in the range of 1.5630-7-3.1250-5 mol•L-1, with correlation coefficient R2= 0.9992. Conclusion: It is found that DAMO-Si-QDs show poor response to
the presence of formaldehyde, while APTMS-Si-QDs got a strong, sensitive and selective response to that in both aqueous and organic phases. In the Tris-HCl buffer (20 mmol•L-1, pH=5), the linear range for formaldehyde detection reaches 3.1250-7-3.1250-5 mol•L-1, and for the detection
in the organic phase, the linear range reaches 1.5630-7-3.1250-5 mol•L-1, in methanol solution. The paper provides a sensitive, selective and simple means for formaldehyde detection in both aqueous and organic phase.
研究领域:
分析化学
·
环境科学
·
生物医学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 11
·1977-1981
·
IF 0
Guan Wang,Jianwei Ji,Xiangxing Xu
Silicon quantum dots (QDs) have attracted much interest in recent years for their prospects in biology and opto-electronics; also, anthracene is a star material for being the first organic molecule to be used in an electroluminescence (EL) device. In this paper, we report dual-emissive Si QDs, with the QD surface modified by 9-ethylanthracene. This hybrid nanomaterial dispersed well in nonpolar solvents such as mesitylene, exhibiting a dual-emission spectrum with peaks centered at 431 and 824 nm, corresponding to the ligand and Si QD related fluorescence, respectively. This is a general strategy for preparing dual-emission Si QDs with wavelengths tunable either by the size of the Si nanocrystals or by the molecules. This dual-emissive hybrid nanomaterial exhibits possible application potential as an active material for visible to near infrared light emitting devices or bio-imaging.
研究领域:
光学
·
纳米科技
·
生物成像
·
材料科学
✓ 已验证
DOI
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Qian Dang,Fan Liao,Yuyang Sun,Shanshan Zhang,Hui Huang,Wen Shen,Zhenhui Kang,Yandi Shi,Mingwang Shao
Though noble metals play a key role in the clean energy research, their wide practical applications have been limited by the high cost and the scarce natural reserves. It is significant to decrease their usage and increase the active sites in the catalysis. Herein, Rh nanocrystals were grown on the surface of silicon quantum dots with the help of Si H bonds to obtain Rh Si composites, which combined with carbon quantum dots to fabricate Rh Si C nanocomposites . The silicon quantum dots limited the size of Rh and prevented the aggregation. The addition of carbon quantum dots greatly increased the electron transportation during the catalytic process. When the Rh Si C nanocomposites were applied as electrocatalysts for hydrogen evolution reaction (HER), the optimal one exhibits Pt-like HER performance (low Tafel slope of 26 mV·dec -1 and long-term stability) with the content of noble metal less than half of that in 20 wt% Pt/C. This work could put forward an effective avenue to develop high efficient and affordable electrochemical catalysts for HER.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Mingwei Zhao,Ying Li,Caili Dai,Yingpeng Chen,Ziteng Yang,Kaiwen Liu,Zhenfeng Ma
Hydrolyzed polyacrylamide (HPAM) is commonly used in polymer flooding, however, it is prone to viscosity reduction at high temperatures and high salinities, weakening its ability to improve oil recovery. In this work, sulfonated modified silicon quantum dots (S-SiQDs) were synthesized and then added to HPAM to study the improvement of rheological properties and enhanced oil recovery performance of HPAM at high temperatures and salinities. It is found that the S-SiQDs with a concentration of only 0.1 wt % can significantly increase the viscosity of HPAM from 28.5 to 39.6 mPa·s at 60 °C and 10,000 mg/L NaCl. Meanwhile, the HPAM/S-SiQDs hybrid solution always possessed higher viscosity and viscoelastic moduli than HPAM, attributed to the hydrogen bonding between HPAM and S-SiQDs. Notably, HPAM/S-SiQDs still maintained elastic behavior at harsh conditions, indicating that they formed a strong network structure. Through oil displacement experiments, it was found that the oil recovery of HPAM/S-SiQDs was higher (28.3%), while that of HPAM was only 17.2%. Thereafter, the utilization sequence of oil during the displacement process was studied with nuclear magnetic resonance experiments. Ultimately, the oil displacement mechanism of HPAM/S-SiQDs was deeply analyzed, including viscosity thickening and wetting reversal.
研究领域:
石油工程
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
LUMINESCENCE
·
2019
·Vol. 34
·期 6
·544-552
·
IF 1.691
Yao Long,Li Zhang,Ying Yu,Bixia Lin,Yujuan Cao,Manli Guo
A simple and rapid detection strategy for vitamin B 12 (VB 12 ) was established based on label-free silicon quantum dots (SiQDs); the detection mechanism was additionally investigated. SiQDs were synthesized using a one-step microwave method, and their fluorescence was stronger than that synthesized using the hydrothermal method. SiQDs fluorescence was quenched using VB 12 due to the inner filter effect (IFE), which was demonstrated using ultraviolet (UV) absorption spectra, fluorescence lifetime, transmission electron microscopy and zeta potential analysis. Subsequently, quercetin (Que) and doxorubicin (Dox) with absorption peaks that overlapped the excitation or emission peaks of SiQDs respectively were used as control groups to investigate the quenching mechanism. Results showed that quenching efficiency was related to the level of overlap between the adsorption peak of the quencher and the excitation or emission peaks of SiQDs. A greater level of overlap caused a higher quenching efficiency. Therefore, the sensitive quenching of VB 12 for SiQDs was due to the synergistic effect of the synchronous overlap between the absorption peak of VB 12 with the excitation and emission peaks of SiQDs. Fluorescence quenching efficiency increased linearly in the 0.5 to 16.0 μmol·L −1 VB 12 concentration range, and the detection limit was 158 nmol·L −1 . In addition, SiQDs were applied to determine VB 12 in tablets and human urine samples with satisfactory recoveries ranging from 97.7 to 101.1%.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Han Jia,Zhe Wang,Xinbo Geng,Rui Sun,Bowen Wang,Xu Li,Xiaolong Wen,Fangning Fan,Shijie Wen,Qiang Wang
Nowadays, the nanoparticles had attracted tremendous attention in enhanced oil recovery (EOR) due to their ultrasmall size, large specific surface area and unique quantum effect. In this research, the amphiphilic silicon quantum dots (SiQDs) were successfully modified by different alkyl chains through the facile process. The SiQDs were characterized by Fourier transform infrared spectrometer (FT-IR), dynamic light scattering (DLS), transmission electron microscopy (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD) and atomic force microscope (AFM). The water contact angle, interfacial tension (IFT) and expansion modulus were measured to evaluate interfacial properties. Compared with the hexyltrimethoxysilane and octyltrimethoxysilane, the propyltrimethoxysilane with short alkyl chain significantly improved the interfacial activity of the SiQDs@C3–0.3 % to reduce the IFT from 51.0 mN/m to 9.8 mN/m. It was found that both the alkyl chain length of the silane coupling agent and its dosage could significantly affect the amphiphilicity of the SiQDs. Moreover, the optical microscopy, the static multiple light scattering and the rheometer were employed to confirm the remarkable stability and the high viscosity of SiQDs@C3–0.3 % stabilized emulsion, which were attributed to the rigid interfacial film and the three-dimensional interparticle network generated by the SiQDs@C3–0.3 %. Finally, the core-flooding experiments suggested the SiQDs@C3–0.3 % stabilized emulsion enhanced oil recovery by 22.1 %.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Shuchen Pei,Xin Hou,Yuting Chi,Wanlin Sun,Fang Chen,Kang Luo,Shuiqin Chai
The excessive use of antibiotics and the presence of tetracycline (TC) residues poses a significant threat to human health. It is imperative to develop antibacterial materials which address the issue of bacterial resistance as well as to establish reliable methods for detecting TC to ensure food safety. This study reports the synthesis of silicon quantum dots (SiQDs) with blue fluorescence emission at 420 nm via a hydrothermal method, using allyloxytrimethylsilane, triacetoxy(methyl)silane as the silicon sources and sodium citrate as a reducing agent. The synthesized SiQDs demonstrated remarkable photostability in 60 min of UV irradiation as well as pH-stability across a range from 2.09 to 11.92. They exhibited salt tolerance and anti-oxidant capacity, even when the concentrations of NaCl and H 2 O 2 were up to 4 mol/L and 1000 μmol/L, respectively. Notably, the SiQDs displayed efficient antibacterial activity without resistance by electrostatic interaction and excessive production of reactive oxygen species (ROS), which would damage the bacterial cell walls and subsequently inhibit bacterial growth and reproduction. The minimum inhibitory concentration of SiQDs was 0.45 mg/mL against Escherichia coli and 0.25 mg/mL against Staphylococcus aureus , respectively. Besides, a fluorescence nanoprobe based on SiQDs was meaningfully constructed to sensitively and rapidly determine TC owing to the internal filtration effect. The limit of detection for SiQDs to TC was 0.0006 μmol/L with a linear range from 0.001 to 0.010 μmol/L. The probe's practicality was confirmed in spiked honey samples from different manufacturers with an approximate 100 % recovery of TC. Consequently, this research presents a promising avenue for enhancing the detection of TC in food safety and the development of antibacterial agents without bacterial resistance.
研究领域:
生物化学
·
食品安全
·
微生物学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS EXPRESS
·
2024
·Vol. 32
·期 19
·32813-32820
·
IF 3.2
Kai Li,Kai Li,Dan Yuan,Dan Yuan,Dong Zhong,Dong Zhong,Zongsong Gan,Zongsong Gan,Zongsong Gan
Laser direct lithography allows for the maskless production and alignment of nanocrystals. However, laser-induced crystal growth requires a complex process of nucleation followed by growth that takes a long time, resulting in low efficiency. Here, we used a laser explosion to pre-grow silicon seed crystals in a silicon precursor solution, simplified crystal growth and increased the lithography efficiency. By operating the laser exposure time, the crystal size can be controlled, and even inducing the fusion of nanocrystalline into single crystal grains. As a proof of concept, we fabricated silicon quantum dot architectures with a direct lithography rate of 350 µm/s by this strategy, achieving quantum dot growth within ∼0.54 milliseconds time in an ambient environment. The silicon quantum dots could be contact and fusion through a laser modulation, ultimately forming single silicon microcrystals within the architectures of lithography.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Shiyao Ma,Tong Yue,Xincai Xiao,Han Cheng,Dan Zhao
The concept of synergistic effect has been widely applied into various scientific research areas, ranging from life science to material science, nevertheless it has been rarely adopted in the synthesis of quantum dots (QDs). This proof-of-concept study was the preparation of ultra-bright silicon QDs with a relative quantum yield of up to 84.92% based on the synergistic effect of two reductants, whilst silane coupling agent as the silicon source. Compared with the conventional one-reductant strategy, our as-prepared silicon QDs exhibit greatly enhanced quantum yields with even tunable emission wavelength , meanwhile, inheriting other merits including good pH, salt tolerance, small particle size and amino-rich surface, which is conducive to biological applications. The highly efficient and stable photoluminescence of silicon QDs could definitely facilitate their prospective applications as optical materials.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Yinhui Yi,Lirong Liu,Wei Zeng,Baohe Lv,Gangbing Zhu
Being awfully harmful to the environment and human health, the sensitive and selective determination of p-dihydroxybenzene (p-DHB) in environmental water is of great significance. However, the similar structures and properties of p-DHB with catechol (CC; one p-DHB isomer) make the selective and reliable determination of p-DHB from CC in environmental waters being still a formidable challenge. In this manuscript, by preparing CC stabilized silicon quantum dots (C-SiQDs) via a simple hydrothermal process and using C-SiQDs simultaneously as a catalyst and fluorescence indicator, a novel nanosensing platform was successfully developed to selectively and sensitively detect p-DHB with double signals: fluorescence and colorimetric. For detecting p-DHB, C-SiQDs could catalyze the oxidation of p-DHB to form benzoquinone (BQ), an intermediate, which lead to the color change from pale yellow to dark brown and the efficient quenching the fluorescence of C-SiQDs. While for CC in samples, it could not contact C-SiQDs surface due to the great steric hindrance effect from CC on quantum dots surface, thus restricting the oxidation of CC and production of BQ, and leading that the obtained C-SiQDs have no response towards CC. Meanwhile, the developed nanosensor could also avoid various other possible interferences. Under optimized conditions, wide linear ranges (from 0.01 μM to 50.0 μM) and low detection limits (4.0 nM) were obtained for p-DHB. The simple and reliable C-SiQDs-based double signals proposal demonstrated to be potentially applicable for the highly selective and sensitive detection of trace p-DHB in various environmental water samples.
研究领域:
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
·
2018
·
IF 5.667
Yingnan Liu,Qinzhi Wang,Shuwen Guo,Pei Jia,Yuhang Shui,Siyu Yao,Chen Huang,Min Zhang,Li Wang
Hydroquinone (HQ) is a major phenol compound pollutant derived from industrial wastewater. Its content in environmental water is closely related to the water quality. Thus, it is in great need to develop facile, sensitive and selective detection methods for HQ. In this paper, an effective and selective HQ detection probe was fabricated based on novel silicon quantum dots (SiQDs), which were synthesized by a one-step hydrothermal method. Such SiQDs exhibited good water solubility and intensely green fluorescence. Interestingly, their fluorescence can be significantly quenched upon addition of HQ, which is attributed to the electron transfer from SiQDs to the generated 1,4-benzoquinone, and the inner filter effect of SiQDs-1,4-benzoquinone complex. This SiQD probe can detect HQ in a wide concentration range from 6 to 100 μM, with a detection limit of 2.63 μM. More importantly, compared with other reported methods, this probe can eliminate the interference from catechol (CC) and resorcinol (RS), and gives new insight on the discrimination HQ from its isomers. Furthermore, this fluorescent probe was also successfully applied for the determination of HQ in real water samples with satisfactory recoveries, indicating the reliability and potential application of this fluorescent probe for monitoring HQ.
研究领域:
环境科学
·
分析化学
✓ 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）