RSC Advances
·
2019
·Vol. 9
·期 27
·15307-15313
·
IF 3.049
Ling Cao,Panpan Wang,Li Chen,Ying Wu,Junwei Di
This work reports the first construction of the ternary layers of ITO/PbS/SiO2/AuNPs nanostructure for development of photoelectrochemical (PEC) glucose sensor. Herein, the thioglycolic acid-capped PbS quantum dots was employed as a PEC active probe, which is very sensitive to oxygen. The small gold nanoparticles (AuNPs) were act as nanozyme (mimic enzyme of glucose oxidase) to catalytically oxidize glucose in the presence of oxygen, meanwhile consumed oxygen and then resulted in the decrease of cathodic photocurrent. The insertion layer of SiO2 nanoparticles between PbS and AuNPs could reduce efficiently the base current due to its low electroconductivity, which improved the detection limit. The proposed PEC sensor exhibited high sensitivity and gold selectivity towards glucose. The linear response of glucose concentrations ranged from 1.0 μM to 1.0 mM with detection limit of 0.46 μM (S/N = 3). The results suggest the potential of design and development of numerous nanozyme-based PEC biosensors with the advantage of the simplicity, stability, and efficiency.
研究领域:
生物传感技术
·
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 4
·252
·
IF 4.2
Zhixiang Hu,Licheng Zhou,Long Li,Binzhou Ying,Yunong Zhao,Peng Wang,Huayao Li,Yang Zhang,Huan Liu
Colloidal quantum dots (CQDs) are gaining increasing attention for gas sensing applications due to their large surface area and abundant active sites. However, traditional resistor-type gas sensors using CQDs to realize molecule recognition and signal transduction at the same time are associated with the trade-off between sensitivity and conductivity. This limitation has restricted their range of practical applications. In this study, we propose and demonstrate a monolithically integrated field-effect transistor (FET) gas sensor. This novel FET-type gas sensor utilizes the capacitance coupling effect of the CQD sensing film based on a floating gate, and the quantum capacitance plays a role in the capacitance response of the CQD sensing film. By effectively separating the gate sensing film from the two-dimensional electron gas (2DEG) conduction channel, the lead sulfide (PbS) CQD gate-sensitized FET gas sensor offers high sensitivity, a high signal-to-noise ratio, and a wide range, with a real-time response of sub-ppb NO2. This work highlights the potential of quantum dot-sensitized FET gas sensors as a practical solution for integrated gas sensor chip applications using CQDs.Keywords:colloidal quantum dot;PbS;FET-type gas sensor;ligand exchange;capacitance
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2026
·
IF 4.6
Meiqi Wang,Chen Yin,Yuxuan Du,Huan Liu,Bin Sun
Large-sized lead sulfide (PbS) colloidal quantum dots (CQDs) face significant stability challenges in near-infrared applications due to increased surface active sites. While traditional halogen ligands achieve preliminary passivation, they are prone to dissociation under high-temperature operating conditions, leading to rapid device performance degradation. This study proposes an aromatic bidentate ligand passivation strategy based on 2-picolinic acid (2-PCA). The device demonstrates an external quantum efficiency (EQE) of 35% at 1650 nm wavelength, with responsivity and normalized detectivity reaching 0.46 A/W and 3.58 × 1011 jones, respectively representing a 2.33-fold improvement over conventional halogen-passivated devices. Under thermal stress at 180 °C for 2 h, devices with 2-PCA ligands retain approximately 90% of their initial normalized EQE, marking a 15-fold improvement in stability compared to devices using halogen ligands (PbX2, X = Br–, I–), which undergo nearly complete failure. This aromatic bidentate ligand passivation strategy provides a new pathway for developing high-performance infrared photodetectors with enhanced thermal stability.
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产品关联
DOI
PubMed
高影响因子
VACUUM
·
2021
·
IF 3.627
Zhaowang Dong,Xueyi Guo,Bin Yang,Heng Xiong,Wenlong Jiang
Lead sulfide (PbS) is the main component of galena. The traditional method used to prepare metal lead from galena is disadvantaged by high energy consumption and severe pollution. In this paper, an eco-friendly yet simple process is proposed to prepare high-purity metal lead directly from lead sulfide. According to thermodynamic calculation, lead sulfide can be decomposed into metal lead under vacuum. The pathway to decomposition is based on the reaction of 2PbS (s) = 2 Pb (l) + S 2 (g). Besides, an investigation was conducted into the impact of temperature and holding time on the quality of decomposition products and the purity of lead in residue. The investigative results show that the decomposition rate of lead sulfide reached its maximum at 1050 °C for 60 min, which is about 50%, and the purity of the lead in the residue reached 99.51%. When the temperature reached above 1100 °C and the holding time exceeded 40 min, the purity of lead reached as high as 99.81%, but the quality of the residue stayed low. This method contributes a fresh idea to the eco-friendly utilization and efficient purification of galena for preparing high-purity metal lead.
研究领域:
冶金学
·
环境科学
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Huaxiao Xie,Zhentao Zhou,Heng Xiong,Xiumin Chen,Pan Deng,Yizhao Wang,Huan Yang,Chaosong Meng
Jamesonite (Pb 4 FeSb 6 S 14 ) is a complex antimony sulfide mineral and an important raw material for the extraction of lead and antimony. Under vacuum conditions, the internal interaction mechanism of PbS and Sb 2 S 3 during thermal decomposition is unclear and difficult to separate. In order to explore the interaction mechanism between PbS and Sb 2 S 3 , the thermodynamic data of Pb-S and Sb-S systems were firstly calculated by thermodynamic calculation method, PbS and Sb 2 S 3 cluster substances that may exist in the gas phase were obtained under the given temperature conditions. On this basis, ab initio molecular dynamics was used to calculate the mean square displacement and diffusion coefficient of PbS and Sb 2 S 3 gas phase clusters. The vacuum distillation experiments of lead sulfide and antimony trisulfide confirmed the volatilization and diffusion of PbS and Sb 2 S 3 , and verified the theoretical calculation results. According to the experiment, the volatilization temperature of Sb 2 S 3 is much lower than that of PbS. The theoretical calculation results are consistent with the experimental results, which indicates that the calculation of the diffusion properties of PbS and Sb 2 S 3 gas phase clusters by molecular dynamics simulation is reliable. This is also an effective and simple method to predict whether the mixed melt of PbS and Sb 2 S 3 can be separated, which provides theoretical guidance for the vacuum separation of PbS and Sb 2 S 3 .
研究领域:
矿物学
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材料科学
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热力学
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产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Song Jie,Han Jiaxuan,Zhang Rong,Dou Yufang,Li Shenggang,Zhang Min
This study extracted an antibacterial component from the natural plant Plantago asiatica L. to gain Plantago extract (PTE); PTE was then compounded with polybutylene succinate (PBS) to prepare an antibacterial composite material. To further improve the compatibility of PBS and PTE, chitosan (CS) and hydroxypropyl- β -cyclodextrin (H- β -CD) were used to modify PTE, resulting in the preparation of CS-PTE microcapsules and (H- β -CD)-PTE microcapsules. And CS-PTE microcapsules and (H- β -CD)-PTE microcapsules were added to PBS at different ratios to prepare PBS/CS-PTE and PBS/(H- β -CD)-PTE composite materials. FTIR and SEM tests showed that both microcapsules were successfully prepared and confirmed the antibacterial activity of PTE by inhibition circles method. The binding energy of the composites shifted slightly, indicating that the microcapsules formed intermolecular forces with PBS. The 2 θ angular strength of XRD gradually weakened with the increase in microcapsule addition, and the crystallinity decreased, as well as the thermal and mechanical properties. However, the thermal properties were better than those of PTE/PBS composites, and the thermal properties better than PTE/PBS composites. The hydrophilicity of PBS/(H- β -CD)-PTE composites improved significantly with the addition of microcapsules. The molecular simulation results showed that the intermolecular interaction between PBS and CS-lignans was stronger, and its compatibility was better.
研究领域:
材料科学
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植物学
·
微生物学
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产品关联
DOI
高影响因子
Journal of Innovative Optical Health Sciences
·
2024
·
IF 2.3
Yuxiang Gao,Chi Zhang,Lijun Zhu,Zhong Du,Rong Ma,Le Guo,Nuernisha Alifu,Xueliang Zhang
Triple-negative breast cancer (TNBC) is an aggressive and often fatal disease, especially since the brain metastasis of TNBC has been a particularly severe manifestation. However, brain metastasis in TNBC at early stages often lacks noticeable symptoms, making it challenging to detect. Near-infrared II (NIR-II) fluorescence microscopic imaging obtains long wavelength, which enables reduced scattering, high spatial resolution and minimal autofluorescence, it is also a favorable imaging method for tumor diagnosis. PbS@CdS quantum dots (QDs) are one of the popular NIR-II fluorescence nanoprobes for well brightness. In this study, NIR-II emissive PbS@CdS QDs were utilized and further encapsulated with thiol-terminated poly(ethylene oxide) (SH-PEG, MW = 5000) to form PbS@CdS@PEG QDs nanoparticles (NPs). The obtained PbS@CdS@PEG QDs NPs were then characterized and further studied in detail. The PbS@CdS@PEG QDs NPs had large absorption spectra, exhibited strong NIR-II fluorescence emission at approximately 1300 nm, and possessed good NIR-II fluorescence properties. Then, the mice model of early-stage brain metastases of TNBC was established, and the PbS@CdS@PEG QDs NPs were injected into the tumor-bearing mice for NIR-II fluorescence microscopic bioimaging. The brain vessels and tumors of the living mice were detected with high spatial resolution under the NIR-II fluorescence microscopic imaging system with irradiation of 808 nm laser. The tumor tissues were further restricted and prepared as thin slices. The NIR-II fluorescence signals were collected from the tumor slices with high spatial resolution and signal-to-background ratio (SBR). Thus, the PbS@CdS@PEG QDs NPs-assisted NIR-II fluorescence microscopic system can effectively achieve targeting brain metastases of TNBC imaging, offering a novel and promising approach for TNBC-specific diagnosis.
研究领域:
肿瘤学
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医学影像学
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纳米医学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 22
·2000594
·
IF 16.836
Yong Xia,Wei Chen,Peng Zhang,Sisi Liu,Kang Wang,Xiaokun Yang,Haodong Tang,Linyuan Lian,Jungang He,Xinxing Liu,Guijie Liang,Manlin Tan,Liang Gao,Huan Liu,Haisheng Song,Daoli Zhang,Jianbo Gao,Kai Wang,Xinzheng Lan,Xiuwen Zhang,Peter Müller-Buschbaum,Jiang Tang,Jianbing Zhang
Trap states in colloidal quantum dot (QD) solids significantly affect the performance of QD solar cells, because they limit the open-circuit voltage and short circuit current. The {100} facets of PbS QDs are important origins of trap states due to their weak or missing passivation. However, previous investigations focused on synthesis, ligand exchange, or passivation approaches and ignored the control of {100} facets for a given dot size. Herein, trap states are suppressed from the source via facet control of PbS QDs. The {100} facets of ≈3 nm PbS QDs are minimized by tuning the balance between the growth kinetics and thermodynamics in the synthesis. The PbS QDs synthesized at a relatively low temperature with a high oversaturation follow a kinetics-dominated growth, producing nearly octahedral nanoparticles terminated mostly by {111} facets. In contrast, the PbS QDs synthesized at a relatively high temperature follow a thermodynamics-dominated growth. Thus, a spherical shape is preferred, producing truncated octahedral nanoparticles with more {100} facets. Compared to PbS QDs from thermodynamics-dominated growth, the PbS QDs with less {100} facets show fewer trap states in the QD solids, leading to a better photovoltaic device performance with a power conversion efficiency of 11.5%.
研究领域:
材料科学
·
纳米技术
·
光伏技术
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产品关联
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Huilin Li,Xiantao Jiang,Wenbin Ye,Han Zhang,Li Zhou,Feng Zhang,Donghong She,Ye Zhou,Su-Ting Han
Neuromorphic computing has attracted great attention to mimic the brain functions of perception, learning and memory, which are considered to overcome the von Neumann bottleneck. Here, we developed a novel neuromorphic device based on the ZnO/PbS hybrid heterostructure in order to emulate the bio-synaptic activities in the fully photon modulated mode. Owing to regulation of the conduction state, the excitatory and inhibitory activities have been emulated with the excitation of long-wavelength and short-wavelength photons in the ZnO/PbS neuromorphic device. Excitatory plasticity can be mimicked with the UV light, and IR light induces the inhibitory effect. Furthermore, other synapse functions have also been emulated in these modes, including long-term plasticity, short-term plasticity, paired-pulse facilitation/depression, spike-rate-dependent plasticity, etc. Meanwhile, an artificial neural network has been simulated based on the synaptic plasticity of the excitatory and inhibitory effect in the fully photon modulation, and recognition rates up to 67 ± 6% can be achieved to distinguish the letter images. Our multifunctional artificial synapse based on the fully photon stimulation can open up a new and efficient way for constructing neuromorphic systems .
研究领域:
材料科学
·
神经科学
·
计算机科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yan Lei,Di Zhang,Jinpeng Wu,Haodan Guo,Xiangrong Li,Yanyan Fang,Dongmei Xie,Yuan Lin
Solar cells based on colloidal quantum dots (CQDs) have achieved great progress in recent years. However, the stable and high performance all solid solar cells using CQDs as light absorber are numbered till now. In this work, CdSe CQDs solid state solar cells have been fabricated as a case for revealing the reasons of low photoelectric conversion efficiency. It finds that the inefficient photoinduced hole transport block the improvement of the photoelectric performance. For facilitating the hole transport, a thin PbS interlayer has been fitted between the CQDs and hole transport layer, and as a result the photocurrent receives about 7.8 times increase in the devices constructed with 5.1 nm CQDs. Finally, a 1.29% of PCE is obtained from the solar cells with FTO/TiO 2 /CdSe CQDs/PbS/ Sprio-MeOTAD/Ag structure.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2012
·
IF 1.867
Jingwen Liao,Yu Zhang,Guoxin Tan,Chengyun Ning
Conducting polymer coatings have unique property and performance allowing potential application in various fields. In this article, we fabricated a nanostructured polypyrrole (PPy) coating on biomedical titanium via template-free electrochemical polymerization in a phosphate buffer solution (PBS). Field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM) were utilized to observe the morphology of nanostructured PPy coatings. Raman spectra and X-ray photoelectron spectroscopy (XPS) were employed to characterize the molecular structure and element composition of the obtained product. The results showed that conducting PPy coatings of high roughness, with aligned nanofibrous structure and inner diameter of 20 ± 5 nm, have been successfully fabricated on titanium. Moreover, the morphology of nanostructured PPy coatings could be regulated with the reaction time varying.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
CHEMICAL PHYSICS
·
2020
·
IF 1.771
Van-Tuan Mai,Ngoc-Huyen Duong,Xuan-Dung Mai
The relation between surface chemistry and (Opto)electrical properties of lead sulfide quantum dots (PbS QDs) is of importance for the development of cost-effective field-effect transistor (FETs) and quantum dot solar cells. Herein, simple chloride surface treatment has been demonstrated by adding tetramethylammonium chloride (TMACl) into a QD washing step. Absorption, photoluminescence (PL) and X-ray photoelectron spectroscopic studies revealed that Cl − ions bound strongly to PbS QDs surfaces resulting in enhanced PL of colloidal QDs. Furthermore, FET studies on PbS QD thin films fabricated by an identical solid-state ligand exchanging with 1,2-ethanedithiol (EDT) showed that TMACl treatment enhanced hole mobility by ten times and at the same time switched the EDT-treated QD thin film from p-type to ambipolar semiconductor with electron mobility of 2.8 × 10 −2 cm 2 V −1 s −1 . The results demonstrated herein offer a simple treatment for the fabrication of multiple QD junctions with minor change in processing.
研究领域:
材料科学
·
纳米技术
·
半导体物理
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DOI
高影响因子
危险品化学品经营许可证（带存储）