DYES AND PIGMENTS
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2026
·
IF 3.9
Jiatao Hu,Zhaoxin Fan,Zhihao Li,Yuxia Zhao,Yu Luan,Xia Wang,Hao Lv
Dandelion seed pappus as a green scattering medium for low-threshold random lasers and speckle-free imaging. • Rhodamine 6G laser dye was combined with dandelion seed pappus biowaste to construct a green, low-threshold random laser. • The biogenic scattering network delivers an ultralow lasing threshold of 5.81 μJ/mm 2 with stable coherent emission. • Replica symmetry breaking confirms the phase transition from ASE to stable random lasing in dye-biomass hybrid system. • The laser dye-based random laser enables 301% SNR enhancement and 86% speckle reduction for high-fidelity imaging. Developing efficient laser dyes with sustainable biogenic scatterers is highly desirable for green optoelectronics. This work reports a high-performance random laser (RL) system using Rhodamine 6G as laser dye and dandelion seed pappus (DSP) biowaste as a natural scattering medium. By integrating DSP fibers with Rhodamine 6G as the gain media and polyvinylpyrrolidone dispersants in an ethanol solution, we constructed a three-dimensional disordered scattering network. Systematic optimization revealed a remarkably low lasing threshold of 5.81 μJ/mm 2 at a DSP concentration of 2 mg/mL. This superior performance is attributed to the naturally evolved, irregular flake-like microstructures of DSP, which maximize multiple scattering efficiency while minimizing parasitic optical loss. The underlying physics was elucidated through power fourier transform (PFT) analysis to identify the effective cavity length— L C = 191.20 μm, while replica symmetry breaking (RSB) validated the transition to stable, coherent random lasing with high spectral integrity over 1500 pulses. Leveraging its intrinsically low spatial coherence, the DSP-based RL was deployed for high-fidelity speckle-free imaging, yielding a 301% enhancement in signal-to-noise ratio (SNR) and an 86% reduction in speckle contrast compared to conventional coherent lasers. The practical utility was successfully demonstrated across resolution targets, biological specimens, and microelectronic architectures. This work provides a compelling strategy for converting seasonal plant waste into advanced functional materials, offering a robust, green roadmap for next-generation biomedical imaging and optical inspection systems.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Chenglin Li,Xingqing Feng,Shenhao Yang,Hao Xu,Xiaoxing Yin,Yanyan Yu
Circulating tumor cells (CTCs) play a key role in the development of tumor metastasis. It will be a big step forward for CTC application as a reliable clinical liquid biopsy marker to be able to identify the captured CTCs while achieving a high capture efficiency within one analytical system. Herein, in this work, a stimuli-responsive and rhodamine 6G (Rho 6G)-entrapped fluorescent metal–organic framework (MOF) probe, named MOF-Rho 6G-DNA, was designed to capture, detect, and subsequently identify CTCs from blood samples of cancer patients. The probe was fabricated by modifying the epithelial cell adhesion molecule (EpCAM) hairpin DNA aptamer with Rho 6G enclosed and an Arm-DNA-attached UiO-66-NH2 MOF by sequence complementation. CTCs could be captured by the EpCAM hairpin DNA on the probe; as a result, Rho 6G loaded in the probe was released, and the number of CTCs was positively related to the concentration of released Rho 6G. An excellent correlation of fluorescence intensities with CTC numbers was obtained from 2 to 500 cells/mL. More importantly, the MOF-Rho 6G-DNA probe simultaneously realized rapid identification of the captured cells within 30 min by only relying on the residue Rho 6G in the MOF cavity. The captured target cells can be conveniently released from the probe using the complementary DNA sequence. These performance features of the probe were further verified by blood samples from patients of various types of tumor.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
·
IF 5.279
Xiaoqian Xie,Mingfei Pan,Liping Hong,Kaixin Liu,Jingying Yang,Shan Wang,Shuo Wang
In this study, the rhodamine 6G hydrazide (R6GH) complex was synthesized to develop an “off–on” output platform for fluorescence and visual dual-mode analysis of lead(II) (Pb2+). The prepared R6GH complex using the heat to reflux reaction of rhodamine 6G (R6G) and hydrazine hydrate was characterized through FT-IR, MS, 1H NMR, and 13C NMR and demonstrated to have good fluorescence stability and reversibility. The microenvironment for Pb2+ detection has been optimized in detail. Under the optimal conditions, the “off–on” R6GH-based fluorescence output platform showed a good response to Pb2+ in the concentration range of 0.05–6.0 μM (R2 = 0.9851) with a limit of detection (LOD) of 0.02 μM. Furthermore, at three spiked Pb2+ levels in the selected agricultural (tap water, soil) and food (fish, shrimp) samples, the developed R6GH-based fluorescence assays obtained a significant recovery range of 84.0–102.0% (RSD < 5.0%, n = 3), which had a good correlation with the results from ICP-MS (R2 = 0.9915). The developed R6GH immobilized paper-based array sensor can reach the lower LOD (2.5 μM) for Pb2+ through the naked eye. By combining with LAB analysis, a good linear response was obtained in the Pb2+ concentration range of 1.0–50.0 μM. These results indicated that the developed R6GH probe had great application potential in accurate detection of fluorescence and rapid visual and semiquantitative screening for Pb2+.
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FOOD CHEMISTRY
·
2019
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IF 5.399
Yuanyuan Li,Weiye He,Qiuchen Peng,Liyu Hou,Juan He,Kai Li
Using an aggregation-induced emission luminogen (AIEgen) as the fluorescence signal part, a novel molecularly imprinted polymers (MIPs) based ratiometric fluorescence sensor ( AIE-MIPs-1 ) was developed for detecting Rhodamine 6G (Rh6G) in food samples including dried papaya and beverage. The sensor exhibited strong blue fluorescence itself at 420 nm. Upon the adsorption of Rh6G, the original fluorescence intensity decreased while a new fluorescence emission peak at 562 nm increased gradually, which showed typical ratiometric fluorescence change. Good linear relationship between the fluorescence intensity ratio (I 562 /I 420 ) and the concentration of Rh6G was obtained in the range of 0.0–10.0 μmol/L. A detection limit of 0.26 μmol/L Rh6G was achieved. Moreover, AIE-MIPs-1 exhibited good sensitivity towards Rh6G over other colorants. This study provided a new strategy for construction of MIPs-based fluorescence sensors by introducing AIEgens as the fluorescence signal part, which will significantly expand the categories and application ranges of MIPs-based fluorescence sensors.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
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IF 9.446
Shengyan Pu,Rongxin Zhu,Hui Ma,Daili Deng,Xiangjun Pei,Fei Qi,Wei Chu
Photogenerated electron/hole recombination greatly limits the catalytic efficiency of TiO 2 , and recently modification with graphene substance has been regarded as an effective way to enhance the photocatalytic performance of TiO 2 . When referring to the fabrication of graphene based materials, the reduction process of graphene oxide has been demonstrated to be a key step. Therefore, it is highly required to develop an efficient and simple route for the GO reduction and the formation of TiO 2 @rGO composites. In this study, we have demonstrated a facile and environmentally friendly strategy for in-situ preparation of the TiO 2 @rGO “dyade” hybrid and systematically investigated the photodegradation efficiency of the resultant composite by utilizing rhodamine 6G as the model pollutant. The obtained TiO 2 @rGO has a significant enhancement in photo energy adsorption leading to the effective photocatalytic degradation reactions. The results indicated that the best performance was conducted by the TiO 2 @rGO (10 wt%, 120 min’s irradiation), which exhibited more than triple the higher photodegradation rate than commercial TiO 2 (P25) nanoparticles mainly due to two aspects, the rapid separation of h + / e − and to improve adsorption. This work provides new insight into the synthesis of TiO 2 @rGO composites as a high performance photocatalyst for the degradation of organic contaminant.
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Foods
·
2023
·Vol. 12
·期 5
·1085
·
IF 5.2
Ziwen Zhang,Ran Han,Sixuan Chen,Feilin Zheng,Xinmiao Ma,Mingfei Pan,Shuo Wang
In this study, a rapid fluorescent and colorimetric dual-mode detection strategy for Hg2+in seafoods was developed based on the cyclic binding of the organic fluorescent dye rhodamine 6G hydrazide (R6GH) to Hg2+. The luminescence properties of the fluorescent R6GH probe in different systems were investigated in detail. Based on the UV and fluorescence spectra, it was determined that the R6GH has good fluorescence intensity in acetonitrile and good selective recognition of Hg2+. Under optimal conditions, the R6GH fluorescent probe showed a good linear response to Hg2+(R2= 0.9888) in the range of 0–5 μM with a low detection limit of 2.5 × 10−2μM (S/N = 3). A paper-based sensing strategy based on fluorescence and colorimetric analysis was developed for the visualization and semiquantitative analysis of Hg2+in seafoods. The LAB values of the paper-based sensor impregnated with the R6GH probe solution showed good linearity (R2= 0.9875) with Hg2+concentration in the range of 0–50 μM, which means that the sensing paper can be combined with smart devices to provide reliable and efficient Hg2+detection.Keywords:Hg2+;R6GH;dual mode;fluorescence;visualization
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Simiao Zhang,Ning Zhang,Shishuang Wang,Zhenshun Li,Weiqing Sun,Mei Zhou,Yurong Zhang,Long Wu,Jing Ma
Biogenic amines (BAs) in fish or fish products may render the food toxic, which allow to be used as an indication for microbial spoilage. Thus, it is crucial to construct a rapid and sensitive analytical method for detection of BAs. In this work, based on rhodamine 6G-loaded and MnO 2 nanosheets-coated mesoporous silica nanospheres (MSNs), a highly sensitive fluorescence probe was designed and developed. Wherein, a “signal on” fluorescence was achieved by using R6G (λ emi : 553 nm) as an energy donor and MnO 2 nanosheets as the energy acceptor. As BAs exist, diamine oxidase will catalyze BAs to generate hydrogen peroxide (H 2 O 2 ), which can reduce MnO 2 to Mn 2+ , resulting with the dissociation of MnO 2 nanosheets and the signal recovery of R6G. Under optimal conditions, the analytical method obtained a wide linear detection range of 10 ∼ 400 nM with a detection limit of 5.97 nM (S/N = 3, n = 3). As a proof-of-application study, the analytical method was verified by spiked fish samples with recoveries of 93.97 to 101.57 % and was accurate at 95 % confidence level, indicating its good performance in detection of BAs and promising applications in food safety.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Yu-Han Geng,Yu Xin,Jing Du,Ming-Yi Cui,Yuan-Yuan Liu,Le-Xi Zhang,Bin Ding
Chirality is a ubiquitous phenomenon in nature and has attracted wide attention in the biomedicine, pharmaceutics and biosensing research fields. Enantiomeric recognition of chiral compounds, especially chiral drugs and chiral amino acids, is important for human health and nutrition. In this work, through the encapsulation of L-His&R6G (L-His = L-Histidine; R6G = Rhodamine 6G) into MOF@MOF framework ZIF-67@ZIF-8, composited material L-His&R6G@ZIF-67@ZIF-8 can be obtained. Additionally, through the etching process, a unique yolk-shell ZIF-8 chiral composite optical sensors L-His&R6G@ZIF-8 ( 1 ) can be successfully prepared. Photo-luminescent (PL) experiment also reveals that 1 can highly sensitively detect L-Proline (L-Pro) through the “turn-on” detection strategy (K BH = 1.22 × 10 4 M −1 and detection limit 1.9 μM). Further yolk-shell L-His&R6G@ZIF-8-based fabricate flexible mixed-matrix membranes has been prepared using doctor-blading technique, which show significant fluorescence enhancement effect under ultraviolet lamp. This work also provides the unique example of preparing chiral yolk-shell framework composite sensors, which have broad application in chiral sensing area.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Fan Zhang,Na Wu,Jian Zhu,Jing Zhao,Guo-jun Weng,Jian-jun Li,Jun-wu Zhao
In this work, a combined seed mediated and galvanic replacement strategy has been proposed to design and fabricate two unique nanostructures, including Au@AuAg yolk-shell nanostructures with tunable interior gap and Au multi-spiky nanostructures with tunable spike length. The interior gap of the Au@AuAg yolk-shell nanostructures can be controlled by varying either the amount of AgNO 3 in the first step or the amount of HAuCl 4 in the second step. The SERS activity of Au@AuAg yolk-shell nanostructures was found to increase with increase in the interior gap. Owing to the build-in electromagnetic hot spots induced by plasmonic coupling effect of the Au triangular nanoplate core and AuAg shell especially the intensive coupling between the three sharp tips of the core and the concave of the inner wall of the shell, Au@AuAg yolk-shell nanostructures exhibit significantly higher SERS enhancement compared to their original Au triangular nanoplates. The best enhancement has been achieved when the interior gap of Au@AuAg yolk-shell nanostructures is 10 nm with the enhancement factor of 3.2 × 10 6 for rhodamine 6G, making them promising candidates for SERS-based detection.
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Analytical Methods
·
2018
·Vol. 10
·期 47
·5731-5737
·
IF 2.073
Q. Huang,Y. T. Chen,Y. W. Ren,Z. Y. Wang,Y. X. Zhu,Y. Zhang
A new rhodamine 6G derivative (R6GHP) has been synthesized for quick recognition of copper(II) ions (Cu2+) in aqueous solutions. The structure of R6GHP has been characterized by nuclear magnetic resonance and electrospray ionization mass spectrometry. Upon binding of Cu2+, the fluorescence intensity remarkably increases with about 36-fold enhancement. In addition, the color change from colorless to pink is visible to the naked eye. In optimal conditions, the fluorescence intensity and absorbance of R6GHP show good linearity with concentration of Cu2+ in the ranges of 1.0 × 10−6 to 1.0 × 10−5 mol L−1 and 1.0 × 10−6 to 1.2 × 10−5 mol L−1, respectively, with detection limits of 3.9 × 10−7 mol L−1 and 1.0 × 10−6 mol L−1. Besides, it has been successfully applied to detect Cu2+ in two water samples.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Fan Zhang,Jian Zhu,Jian-Jun Li,Jun-Wu Zhao
Au nanoparticles-based fluorescence quenching has been widely used for many analytes due to its high sensitivity and rapid response. However, the effects of different coating agents of Au nanorods on the assays performance remain unclear. For the first time, we demonstrated that the coating agents play a significant role in Au nanorods-based fluorescence quenching and recovery on Rhodamine 6G (R6G). Polystyrenesulfonate (PSS)-coated Au nanorods could almost totally quench the fluorescence intensity of R6G, whereas cetyltrimethyl ammonium bromide (CTAB)-coated Au nanorods and bare Au nanorods only have little effect on the fluorescence of R6G. The addition of cysteine to PSS-coated Au nanorods-R6G makes the fluorescence recover gradually, even greater than the original fluorescence intensity of R6G. Thus the PSS-coated Au nanorods-R6G could be served as a fluorescent probe to detect cysteine. The fluorescence intensity change of PSS-coated Au nanorods-R6G probe is linear with logarithm of Cys concentration over the range from 0.01 to 2.5 μg/mL. The results provide theoretical guidance for further improving Au nanorods-based fluorescence quenching and detection of protein molecules by the fluorescence off-on mechanism.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jing Wang,Jingyi Li,Chuan Zeng,Qi Qu,Mengfan Wang,Wei Qi,Rongxin Su,Zhimin He
Nonspecificity and low reproducibility are always the main challenges in surface-enhanced Raman scattering (SERS) detection, especially for testing real samples. In this study, we developed a sandwich-like sensor (AuA-pMIP) to detect rhodamine 6G (R6G) by integrating a porous molecularly imprinted polymer (pMIP) with a well-ordered AuNP array (AuA). To form a uniformly distributed hot spot, AuA was fabricated at an oil–water interface and was subsequently fixed between pMIP and a support slide. Finite-difference time-domain simulation indicated that the enhanced electric field covered a distance of ∼2 μm above the AuA, in which the pMIP provided effective mass-transfer channels and sufficient specific binding sites for target molecules. High specificity for AuA-pMIP in R6G detection was demonstrated by comparing the SERS performance of R6G on AuA-pMIP with that of its structural analogues on the same sensor. Remarkably, the stable sandwich-like structure allowed us to achieve a recyclable SERS sensor with high reproducibility. Finally, AuA-pMIP displayed excellent specificity and sensitivity toward R6G in a test based on a real orange juice sample. This study presents a promising method to achieve real sample testing on a SERS platform.
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