ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 30
·8813-8820
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IF 3.125
Fu Zhaofu,Li Gongke,Hu Yufei
A novel chemiluminescence (CL) system based on the reaction of fluorescent water-soluble nitrogen-rich quantum dots (N-dots) and diperiodatoargentate(III) (DPA) was developed. The prepared N-dots have a small size (≤10 nm) and high percentage of nitrogen (39.9 %), which exceeds the content of carbon in the same N-dots. The N-dots exhibit characteristic blue fluorescence under UV light and up-conversion luminescence. The relatively intense CL emission is based on the direct oxidation of N-dots by DPA. The CL emission may be attributed to the high nitrogen content and the special structure of the N-dots. The CL mechanism of N-dots and DPA was investigated by using CL, UV–Vis absorption, IR, fluorescence, and radical scavenging experiments. This investigation provides a way to study the optical properties of N-dots. The analytical applicability of the N-dots and DPA CL system in the determination of ferulic acid (FA) was explored. The CL intensity was linearly proportional to the concentration of ferulic acid from 3.0 × 10 −7 to 1.0 × 10 −5 g mL −1 with a detection limit of 8.0 × 10 −8 g mL −1 (3σ); the relative standard deviation was 2.4 % for 4.0 × 10 −7 g mL −1 FA ( n = 9). The proposed method was successfully applied to the determination of ferulic acid in Angelica sinensis . The study provides valuable insight into the role of nitrogen-rich quantum dots in CL.
研究领域:
分析化学
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生物化学
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PubMed
高影响因子
INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Guang-Ning Liu,Xiao-Ming Jiang,Qing-Shun Fan,Muhammad Bilal Hussain,Ke Li,Hui Sun,Xin-Yu Li,Wan-Qing Liu,Cuncheng Li
In situ alkylation or protonation reactions on the thiazolyl-N donors of benzothiazole (btz) and its derivative 2-aminobenzothiazole (abtz) occurred to form four structure directing agents (SDAs), which feature different structure directing abilities and hydrophobicities. The thiazolyl-N alkylated and protonated btz cations direct to form an α-type (AgI2)− iodoargentate chain in (Etbtz)(AgI2) (1), (Prbtz)(AgI2) (2), and (Hbtz)(AgI2) (3), respectively, while the thiazolyl-N protonated abtz cation directs to form a new type of (Ag2I3)− anionic chain in (Habtz)(Ag2I3) (4). Compounds 1 and 4 represent the first noncentrosymmetric (NCS) hybrid iodoargentates with organic S-containing N-heterocycle derivative cations as SDAs. Further, 1 exhibits high water stability and is second harmonic generation (SHG) active with a response about twice that of KDP (KH2PO4). Importantly, the water stability studies indicate that hybrid iodoargentates with hydrophobic N-alkylated SDAs are more stable in water than those with relative hydrophilic N-protonated SDAs.
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 7
·1-16
·
IF 2.5
Shan Chuanfu,Liu Ziyi,Li Fuchao,Jia Wenhan,Cai Gaotuo,Li Ming,Tang Tao,Li Shuai,Wen Jianfeng,Hu Guanghui,Jiang Li,Li Xinyu
TiO 2 -based materials are important photocatalysts but the rapid recombination of photoexcited electron–hole pairs, and the wide band gap both limit their photocatalytic activities. In this work, p-type phosphorus-doped graphene quantum dots (P-GQDs, 5~20 nm) were combined with n-type TiO 2 nanoparticles (20~50 nm) and n-type silver iodide (AgI, 100~200 nm) by a facile sonication and precipitation process to yield a novel ternary photocatalyst TiO 2 /P-GQDs/AgI with n-p-n heterojunctions. The morphologies, structures, optical properties, and chemical environments of photocatalysts were all studied. The resulting ternary photocatalyst exhibited enhanced visible photocatalytic activity toward the degradation of methyl orange (MO), estimated to 70.4-fold that of pure TiO 2 . By contrast, the photocatalytic activities of TiO 2 /GQDs with an n-n heterojunction, TiO 2 /P-GQDs with a p-n heterojunction, and TiO 2 /GQDs/AgI (30%) with an n-n-n heterojunction showed 4.4-fold, 5.3-fold, and 14.2-fold higher than those of TiO 2. The electrochemical and optical measurements revealed that the enhanced photocatalytic activity was linked to promoted charge carrier separation by n-p-n heterojunctions coupled with the increased absorption in the visible region. Overall, the new band structure connected in series p-n heterojunctions looks promising as a highly efficient photodegradation system for future use in decontamination of polluted water. Graphical abstract
研究领域:
材料科学
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环境科学
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光催化技术
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Boran Xu,Yandong Li,Yangqin Gao,Shuang Liu,Da Lv,Sujun Zhao,Hang Gao,Guoqing Yang,Ning Li,Lei Ge
A novel plasmonic photocatalysts of Ag-AgI/Bi 3 O 4 Cl was successfully synthesized via a simple and mild wet-chemical process. The 30 wt% Ag-AgI/Bi 3 O 4 Cl photocatalyst showed the highest photocatalytic activity for degradation of methyl orange (MO) under visible light (5 W LED lamp), which represents a 3.2 and 7.4 times enhancement in the photocatalytic degradation efficiency as compared to pure Bi 3 O 4 Cl and Ag-AgI, respectively. The surface plasmon resonance (SPR) effect of Ag nanoparticles (NPs) was detected by the UV–vis diffusion reflectance spectroscopy (DRS) and surface photovoltage (SPV) measurement, finding that the SPR effect of Ag extends the absorption and photo-response range in the Ag-AgI/Bi 3 O 4 Cl composite photocatalyst. Based on the analysis of electron spin resonance (ESR), linear sweeping voltammetry (LSV) characterization results, three electron transfer processes were proposed: AgI CB → Bi 3 O 4 Cl CB , AgI CB → Ag and methyl orange → Ag. Such electron transfer paths can not only effectively improve the separation efficiency of photo-generated carriers, but also ensure the stability of the catalyst. This study can provide a novel insight for modification of other desirable semiconductor materials to achieve high photocatalytic activity.
研究领域:
材料科学
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环境化学
·
物理化学
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纳米催化
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半导体光催化
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
·
IF 5.141
Qianshu Xia,Yun Hao,Suimin Deng,Lina Yang,Ruoxin Wang,Xiangfeng Wang,Yuan Liu,Hailing Liu,Mengxia Xie
s Water pollution induced by the productive process of organic dyes would lead to various diseases, and so treatment of the wastewater is an urgent task for protecting human health and ecological environment. In this work, visible light responsive heterojunction material based on silver iodide and carbon dots (CDs) doped ZIF-8 metal organic frameworks ( [email protected] @AgI) has been prepared by a green solvent-free strategy and in-situ ion deposition method. The [email protected] @AgI composites have high photocatalytic performance for degradation of acridine orange (AO) dye under visible light, and the maximum degradation percentage can reach to 96.0%, which was estimated by the UV–visible spectroscopy. The porous structure and large surface area of the photocatalyst were favorable to absorption of the target dye on the catalyst, which can promote the kinetic degradation rate for low level concentration of the dye. The introduction of CDs into the AgI heterojunction can improve the electron transport efficiency and visible light absorption capacity, and thus significantly enhancing the photocatalytic activity of the catalyst. The photocatalytic mechanism was proposed as indirect Z-scheme heterojunction type based on the energy band structure of the catalyst. This work provides a visible light photocatalyst for removal of the AO dye in wastewater and offers a promising strategy for developing photocatalyst for treatment of organic pollutants in the environment using solar energy.
研究领域:
环境科学
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材料科学
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化学工程
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光化学
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高影响因子
ANALYST
·
2019
·Vol. 144
·期 10
·3405-3413
·
IF 4.019
Li Zhong,Xiuqi Li,Ruilin Liu,Xiaoping Wei,Jianping Li
A novel ultrasensitive photoelectrochemical sensor for benzoyl peroxide (BPO) was constructed under visible light irradiation. A novel nanostructured material made of molecularly imprinted polymer (MIP)-modified silver iodide nanoparticle–titanium dioxide nanotube arrays (AgINPs–TiO2 NTs) was designed as a photoactive electrode (denoted as MIP@AgINPs–TiO2 NTs). AgI-sensitized TiO2 nanotube arrays were prepared by a simple dissolution–precipitation–calcination process and then employed as a matrix to graft the MIP recognition element. Such a newly designed molecularly imprinted photoelectrochemical sensor exhibits high sensitivity and selectivity for the determination of BPO. The photoelectrochemical analysis is highly linear over the BPO concentration range from 1 × 10−12 mol L−1 to 5 × 10−10 mol L−1 with a detection limit of 2.53 × 10−13 mol L−1 (S/N = 3, n = 11). The sensor designed based on a low cost and highly sensitive assay was successfully applied in the determination of BPO in spiked samples.
研究领域:
分析化学
·
材料科学
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DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Yuanyuan Yao,Hongding Zhang,Tongtong Tian,Yixin Liu,Rendan Zhu,Ji Ji,Baohong Liu
With the emergence of microRNA (miRNA) as a key player in early clinical disease diagnosis, development of rapidly sensitive and quantitative miRNA detection methods are imperative. Herein, a label-free SERS assay coupled with duplex-specific nuclease (DSN) signal amplification strategy was proposed for facilely ultrasensitive and quantitative analysis of miRNA-21. Firstly, magnetic beads assembled with excessive capture DNA were utilized to hybridize the target miRNA-21. These DNA-RNA heteroduplexes were cleaved by DSN to generate small nucleotide fragments into the supernatant and the miRNA-21 released and rehybridized another DNA, going to the next DSN cycle. Consequently, numerous of small nucleotide fragments of capture DNA were released from magnetic beads and the miRNA-21 signal was transferred and amplified by the SERS signals of total phosphate backbones which are abundant in nucleotide. Furthermore, iodide-modified Ag nanoparticles (AgINPs) was employed to generate a strong and reproducible SERS signal. The proposed method displayed excellent performance for miRNA-21 detection with the linear range from 0.33 fM to 3.3 pM, and a lower detection limit of 42 aM. Moreover, this strategy exhibited effectively base discrimination capability and was successfully applied for monitoring the expression levels of miRNA-21 in different cancer cell lines and human serum.
研究领域:
生物传感器
·
分子诊断
·
分析化学
·
癌症研究
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DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Keqin Deng,Jing Xiao,Zhang Liu,Chunxiang Li,Jinglun Wang,Qingfeng Yi,Haowen Huang,Hu Zhou
ABSTRCT Photocathode-based assay is anti-interference for real sample detection . Photocathode produces low photocurrent signal and gives rise to poor sensitivity. Herein, a novel cathode photoelectrochemical (CPEC) sensing platform based on Ag-AgI-CNTs as photocathode material and K 3 [Fe(CN) 6 ] as photoelectron acceptor was established. Since [Fe(CN) 6 ] 3- effectively accepted photoelectrons from Ag-AgI-CNTs, it greatly enhanced the CPEC response. Combining a surface multisite strand displacement amplification (SMSDA) strategy, the CPEC platform was applied for the activity assay of terminal deoxynucleotidyl transferase (TdT). In this proposal, oligo dT primer tethered on CPEC platform was in-situ extended to generate a polyA tail. Then the polyA tail formed a stable multi-point hybrid structure with the adjacent oligo dT. After launching the SMSDA, the CPEC platform was covered by more elongated polynucleotide chains and network, which acutely hampered the photoelectron transfer (eT) between photocathode and electron acceptor and caused a reduced photocurrent. The CPEC sensor possessed a satisfactory linear response from 6 × 10 -5 -0.1 U and a low detection limit of 1.1 × 10 -5 U. The strategy offered a more specific and sensitive method for TdT activity assay . It was feasible in the field of TdT-based biochemical research, drug screening, and disease diagnosis.
研究领域:
生物化学
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分析化学
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分子生物学
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Huaze Shao,Hong Yan,Qing Tang,Shiquan Zheng,Hanren Chen,Lihong Liu
The overexpression of human epidermal growth factor receptor 2 (HER2) has been linked to aggressive breast cancer and worse clinical outcomes. However, accurately measuring HER2 remains challenging, due to its low serum content. Herein, we developed a novel method for HER2 detection in serum by the combination of aptamer with C-Ag + -C structure, Ag + -released hybridization chain reaction (Ag + -HCR) and coprecipitation of Ag + and gold nanoparticles (AuNPs) in the solution including Eosin Y (EY) and AgI colloids. Following the aptamer bound to HER2, signal amplification occurred through the release of numerous Ag + by Ag + -HCR. This process subsequently induced AuNPs aggregation on the surface of AgI colloids, resulting in reduced fluorescence intensity of EY in the supernatant. The reduced value of EY fluorescence intensity in the supernatant was proportional to the level of HER2. Under optimized reaction conditions, a wide detection range was obtained between 0.09 and 9000 pg/mL with a limit of detection of 11.7 fg/mL in diluted human serum, and 96 serum samples in a 96-well plate could be measured simultaneously by a microtiter plate reader within 2 h. Moreover, the quantitative results of HER2 were consistent with those obtained using the enzyme-linked immunosorbent assay kit ( r = 0.9995). Therefore, leveraging the delicate design of Ag + -HCR signal amplification, this enzyme-free, label-free, and effective method has demonstrated to be capable of detecting HER2 in serum due to its high sensitivity. Remarkably, this method may be extended to detect other cancer-related proteins and genes by replacing the corresponding target sequences.
研究领域:
生物化学
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分子生物学
·
分析化学
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癌症研究
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DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Bai Qingyu,Yang Long,Chen Zhiwei,Li Changyuan,Cheng Ruihuan,Shu Mingfang,Zhu Jinfeng,Liu Ziyue,Yang Yuyan,Yang Jiong,Ren Jie,Voneshen David,Asai Shinichiro,Masuda Takatsugu,Sarker Suchismita,Zhang Yifei,Wu Jiangbin,Tan Ping-Heng,Chen Yue,Ma Jie,Pei Yanzhong
Vortical motion naturally occurs on various scales, from galaxies to skyrmions, influencing the dynamics of mass and information transport. Yet its impact on lattice dynamics in solids is rarely explored so far, primarily owing to the strong interatomic bonds in real materials that inhibit the actual transport of their constituent species. Here we investigate the effect of vortical modes of polarized phonons on the heat insulation of solid materials using synchrotron X-ray diffuse scattering and inelastic neutron scattering along with ab initio molecular dynamics simulations. We demonstrate this vortical vibration as well as its effect on thermal insulation in CsAg 2 I 3 , where the anisotropically bonded iodine atoms form the low-lying transverse optical phonons for enhancing scattering phase space. Moreover, the vortical modes, mainly arising from the chiral symmetric operations acting on the iodine sites, induce two-dimensional short-range-ordering of atomic clusters, lead to a substantially increased phonon scattering centers with a diameter on the order of ~2 primitive cells. This eventually results in extraordinary heat insulation in the single-crystalline CsAg 2 I 3 , exhibiting a thermal conductivity as low as 0.08 W/m-K at room temperature. This strategy establishes a material design paradigm for heat insulation and unveils an unexplored avenue for phonon transport manipulation.
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高影响因子
Materials Futures
·
2025
·
IF 10.8
Xinyu Guo,Wenjin Yu,Xiangdong Li,Hantao Wang,Qinyun Liu,Yu Zou,Yunan Gao,Zhijian Chen,Lixin Xiao,Bo Qu
As environmentally friendly compounds, lead-free perovskites have gained widespread application in the fabrication of solar cells in recent years. Among these, rudorffites such as AgBiI4 are considered as promising candidates owing to their favorable band structure and exceptional stability. However, the formation of Ag vacancies during the synthetic process poses a significant challenge, severely hindering carrier transport properties. To address this issue, we propose an Ag management (AM) strategy utilizing aliphatic ammonium, which serves multiple purposes: it enhances the solubility of AgI in the precursor solution, mitigates phase separation caused by stoichiometric mismatches during AgBiI4 film formation, and effectively passivates Ag defects. The butylamine hydroiodide (BAI) modified AgBiI4 solar cells achieved a champion power conversion efficiency of 1.97%, representing a 26% enhancement over the control device.
研究领域:
材料科学
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能源研究
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Hongge Cao,Yuhang Wu,Ruicai Gao,Peijie He,Qiang Wu,Jixiang Cui,Longyan Gu,Tuo Cai,Ping Peng,Yan Lei,Yuan Lin,Zhi Zheng
Ag 2 S colloidal quantum dots (CQDs) are promising candidates for solution-processable and eco-friendly solar cell applications, but the power conversion efficiency is still far from its theoretical value (∼30 %). Where the migration of Ag ions in Ag 2 S CQDs may be responsible for this. In this work, to suppress the migration of Ag ions and further enhance the photoelectric properties of the Ag 2 S CQDs, Bi elements have been doped into the Ag 2 S CQDs via a facile route at low temperature. Without heat, the Bi content in the resulting Bi-doped Ag 2 S CQDs can be adjusted by adding raw BiI 3 in the reaction system. The photoelectric responsivity of Bi-doped Ag 2 S CQDs is about 6 times greater than that of the undoped Ag 2 S CQDs. Finally, solid-state solar cells have been constructed, and 1.5 % power conversion efficiency has been obtained. Current work may provide an avenue to produce high-quality Ag 2 S CQD-based photoelectric materials.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
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