POLYMER ENGINEERING AND SCIENCE
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2022
·Vol. 62
·期 11
·3831-3840
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IF 2.573
Sen Jiang,Liyan Wang,Rongrong Zheng,Yunsheng Chong,Yanming Chen
The poly(butylene succinate) (PBS) copolyesters modified by 2-methyl-1,3-propanediol (MPO), that is poly(butylene succinate-co-methyl propylene succinate) (PBMS), were synthesized by direct esterification-melt polycondensation method. 1 H NMR showed the PBMS molecules contain two repeating structural units, the butylene succinate (BS) and the 2-methyl-1,3-propylene succinate (MS). The crystalline properties of PBMS were characterized by DSC, POM, and XRD. The results showed the relative crystallinity of PBMS decreases from 45.12% to 38.2%, the size of spherulites also decreases, and the crystallization ability becomes weaker compared with PBS. The water contact angle test proved the surface hydrophilicity of PBMS is improved. The impact strength of PBMS increases from 3.9 to 24.6 kJ/m 2 , and its elongation at break increases from 10.5% to 71.2%, and the transition from brittle fracture to ductile fracture is achieved. The study of enzymatic degradation found that the enzymatic degradation rate of PBMS copolyesters increases significantly with the increase of MPO content. Within 25 days of degradation, the weight loss rate of PBS after degradation is 38.18%, while that of PBMS reaches 100%. Finally, it was also observed the enzymatic degradation of PBS and PBMS starts from the amorphous region and abides by the regular pattern from the periphery to the middle and from the surface to the interior.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Tengzuo Huang,Chunyan Wu,Jinpeng Yang,Pengyu Hu,Lei Qian,Tao Sun,Chaoyu Xiang
The interface VOC loss between the active layer and the hole transport layer (HTL) of lead sulfide colloidal quantum dot (PbS-CQD) solar cells is a significant factor influencing the efficiency improvement of PbS colloidal quantum dot solar cells (PbS-CQDSCs). Currently, the most advanced solar cells adopt organic P-type HTLs (PbS-EDT) via solid-state ligand exchange with 1,2-ethanedithiol (EDT) on the CQD top active layer. However, EDT is unable to altogether remove the initial ligand oleic acid from the quantum dot surface, and its high reactivity leads to cracks in the HTL film caused by volume contractions, which inevitably results in significant VOC loss. These flaws prompted this research to develop a method involving hybrid organic ligand exchange using 3-mercaptopropionic acid (MPA) and 1,2-EDT (PbS-Hybrid) to overcome these drawbacks of VOC loss. The results indicated that the new exchange strategy improved the quality of the HTL film and benefited from the enhanced passivation of the quantum dot surface and better alignment of energy levels, and the average VOC of PbS-Hybrid devices is increased by approximately 25 mV compared to control devices. With the enhanced VOC, the average power conversion efficiency (PCE) of the devices is improved by 10%, with the highest PCE reaching 13.24%.
研究领域:
材料科学
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能源技术
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiaopeng Fan,Dan Zhang,Hongjuan Li,Shiguo Sun,Yongqian Xu
A novel near infrared (NIR) fluorescent hybrid system ( PD-SQ ⊂ BSA ) assembled from squaraine dye PD-SQ and bovine serum albumin (BSA) was developed for selective detection of Ag + over other metal ions in absolute PBS. The detection limit of PD-SQ ⊂ BSA for Ag + is calculated to be about 8.99 × 10 −8 M, which is lower than the guidelines for drinking water set by the WHO. PD-SQ alone shows very weak fluorescence due to aggregation-caused quenching (ACQ) property. BSA can cause PD-SQ to partially disaggregate through electrostatic and hydrophobic interactions, but various metal ions including Ag + cannot do. Interestingly, the presence of both BSA and Ag + can trigger PD-SQ to almost completely disaggregate through synergic binding of multiple S-Ag linkings derived from the biothiol moieties in BSA and PD-SQ with Ag + , resulting in obvious turn-on fluorescence change. Absorption and field emission scanning electron microscope (FESEM) spectra have been used to prove the conversion of PD-SQ from aggregates to monomers. In addition, based on the fluorescence spectra changes of PD-SQ ⊂ BSA system upon addition of Hg 2+ and ethylenediaminetetraacetic acid (EDTA), logic circuits including AND and INHIBIT logic gates with reset function were successfully constructed. This type of fluorescent system shows great potential for disease diagnosis, environmental protection, and information protection at the molecular scale.
研究领域:
生物化学
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环境科学
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分子生物学
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DOI
高影响因子
Advanced Materials Technologies
·
2026
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IF 6
Huaying Zhong,Fan Fang,Jasper Guido Ebel,Qian Chen,Lixin Li,Kaiyu Luo,Yihan Song,Andong Zhong,Haibo Zhu,Xiao Wang,Kaijie Ling,Yong Xia,Haodong Tang,Wei Chen,Peter Müller-Buschbaum
Halide-capped PbS colloidal quantum dots (CQDs) prepared via solution-phase ligand exchange (SPLE) are promising materials for next-generation optoelectronic devices owing to their effective surface passivation. Nevertheless, deep traps and band-tail states in CQD solids are often intertwined, obscuring individual impacts on device performance. Here, we introduce two alkylamines, pentylamine (PA) and hexylamine (HA), as additives in a butylamine-based cosolvent system to decouple these electronic defects. The HA additive significantly suppresses deep trap states by improving halide passivation and directly coordinating with Pb on the CQD surface, whereas the PA additive promotes structural ordering and thus reduces band-tail states in CQD solids due to the formation of a 2D layered structure through its preferential interactions with the halide matrix. Incorporating the HA additive enables PbS CQD photodetectors (PDs) in zero-bias photovoltaic mode to achieve a remarkable responsivity of 0.76 A/W and an external quantum efficiency of 72% in the short-wave infrared (SWIR) region. Thus, device performance is dominated by deep traps at the CQD surface and interfacial defects in the device architecture, providing insights for high-performance CQD optoelectronic devices.
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高影响因子
Nano Research
·
2024
·Vol. 17
·期 12
·10483-10489
·
IF 9.5
Chen Zongwei,Li Zhengxiao,Li Fan,Huo Jingzhu,Meng Xinyi,Ma Shihao,Zhu Wenbo,Guo Fengqi,Hu Jia-Hua,Wu Kaifeng
Precise modulation of photoluminescence (PL) of nanomaterials by external control is of great interest in such diverse areas as photocatalysis, memory and sensing. Recent studies have combined colloidal quantum dots (QDs) with photochromic molecules to construct optically switchable PL systems. However, it still remains challenging to switch the PL on and off in the near-infrared (NIR) region with multi-stimuli such as light and heat. Here, we present light and heat triggered modulation of the NIR PL of PbS QDs using adjacent spiropyran derivatives. The NIR PL of PbS was reversibly switched on and off through the isomerization process of spiropyran molecules that can be triggered by either light irradiation or heating. The PL intensity of the off state is low enough to yield an on/off ratio as high as 54. Transient absorption measurements revealed ultrafast photoinduced hole transfer from PbS to spiropyran, the rate and efficiency of which depend critically on the driving force that can be deeply modulated through spiropyran isomerization. This study not only establishes a novel multi-stimuli switchable PL system in the NIR, but also provides fundamental guidelines for the design for such systems for a variety of emerging applications.
研究领域:
材料科学
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光学
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Shuaipu Zang,Yinglin Wang,Meiying Li,Wei Su,Hancheng Zhu,Xintong Zhang,Yichun Liu
Preparation of electron transport layer (ETL) with high uniformity by convenient and low-temperature process is of essential importance for the future development of colloidal quantum dot solar cells (CQDSCs) into large-area and flexible devices. Herein we utilized magnetron sputtering technique to deposit ZnO thin film as the ETL of PbS CQDSCs. The ZnO film deposited at ambient temperature displayed preferential growth along (001) direction, pinhole free morphology, and good optical transmittance . On rigid SnO 2 :F (FTO) conductive glass substrates , PbS CQDSCs with sputtered ZnO ETL achieved a power conversion efficiency of 6.47% under AM 1.5 G simulated solar irradiation , which was higher than the 6.02% efficiency of the CQDSC fabricated on the benchmarked ZnO nanocrystals ETL. The good uniformity of sputtered ZnO film also facilitated the consistency of photovoltaic parameters of big-sized CQDSCs, as demonstrated by the similar output of four series-connected CQDSC units fabricated in one batch with a total active area of 14.4 cm 2 . Flexible PbS CQDSCs was also fabricated on the sputtered ZnO ETL, using In 2 O 3 :Sn-coated polyethylene terephthalate (ITO-PET) as the substrate, which achieved a power conversion efficiency of 3.87% and displayed negligible decline of the photovoltaic parameters after 100-time bending treatment. Our research demonstrates that the magnetron-sputtered ZnO film, with favorable features of low-temperature process, large-area continuity, and high bending tolerance, presents promising potential for the future development of PbS CQDSCs.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2022
·
IF 7.305
Qi Xiao,Bing Xia,Peilin Liu,Yang Yang,Gaoyuan Yang,Jing Liu,Shuaicheng Lu,Xuezhi Zhao,Ciyu Ge,Duo Chen,Junrui Yang,Guijie Liang,Kanghua Li,Xinzheng Lan,Zewen Xiao,Jianbing Zhang,Liang Gao,Jiang Tang
PbS colloidal quantum dots (CQDs) have been widely applied in infrared (IR) solar cells, as they can broaden the photon conversion region beyond 1100 nm, which can help promote an extra 6% of power conversion efficiency (PCE) as bottom subcells for silicon solar cell. Although halide liquid exchange is the dominant passivation strategy for CQDs, it is difficult to passivate all the surface defects , especially for IR CQD, which leaves the main limitation for improving PCE. Here, a facile in-situ solution-processed patch-passivation strategy was first proposed for developing efficient PbS CQD IR solar cells. A typical Lewis base triphenylphosphine oxide (TPPO) was added to I − /Br − capped PbS CQDs, aiming at passivation with uncoordinated Pb 2+ as a “patch-ligand”. As a result, the phosphorus oxygen bond coordination could help suppress the non-radiative recombination in CQD films. The TPPO-passivated devices delivered an IR PCE as high as 1.36% under silicon-filtered AM 1.5G, along with a promising open-circuit voltage ( V OC ) of 0.44 V, both of which are the highest among other single-junction solar cells with a band gap of ∼0.95 eV. The significant VOC and fill factor (FF) enhancement can be attributed to the decrease in defect density and faster charge transport in TPPO-passivated devices.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Tianbo Zhou,Bing Wang,Xueshuai Wang,Haoran Sun,Yi Liu,Liuchun Zheng
The serious environmental pollution caused by nonbiodegradable plastics has led to an increased demand for biodegradable plastics. Poly(butylene succinate) (PBS) is a very essential biodegradable polymer because of its good combined properties. But its drawbacks of low impact strength and lack of functionality restrain its application. In this work, polydimethylsiloxane (PDMS) is used to synthesize the diatom-like structure poly(butylene succinate)-b-polydimethylsiloxane (PBSP), and the effect of molecular weight on the structure and properties is investigated systematically for the first time. The unique layered structure limited by the covalently connected blocks endowed PBSP with an excellent combined performance. The resulting PBSP possesses good thermal and mechanical properties. The mechanical properties improved substantially; especially, the impact strength increased evidently from 34.6 J/m of PBS to 162.5 J/m of PBSP. Furthermore, PDMS blocks endow the copolymers with good hydrophobicity and antismudge and self-healing properties, which greatly broadens the application range of the PBS materials. The surface analysis and Flory–Huggins solution theory testified that the PDMS blocks with higher molecular weight preferentially enriched the surface and sublayer of the material, due to the huge difference in solubility parameters between PBS and PDMS. PBSP with regulatable mechanical properties and functions could be obtained by changing the molecular weight of the PDMS blocks.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ANALYST
·
2011
·Vol. 136
·期 19
·3934-3942
·
IF 3.913
Beibei Chen,Bin Hu,Ping Jiang,Man He,Hanyong Peng,Xing Zhang
A sensitive and selective on chip magnetic immunoassay method, based on a sandwich-type immunoreaction with PbS nanoparticle (NPs) labels in combination with electrothermal vaporization-inductively coupled plasma mass spectrometry (ETV-ICP-MS), was proposed for the determination of carcinoembryonic antigen (CEA). We designed and fabricated a microfluidic chip for magnetic immunoassay, and the prepared iminodiacetic acid modified silica coated magnetic nanoparticles (IDA-SCMNPs) were packed into the central microchannel to form a solid phase column by self-assembly under the magnetic field. After completion of the immunoreaction involving a primary antibody, CEA and a secondary antibody labeled with PbS NPs on a magnetic solid phase packed-column, ETV-ICP-MS was used to determine the concentration of Pb that was released from the captured PbS NPs using an acid-dissolution step. The concentrations of CEA can be correlated with that of Pb. The established method demonstrated a limit of detection of 0.058 μg L−1 for CEA, with a relative standard deviation (RSD) of 6.7% (c = 10 μg L−1, n = 7). A linearity ranging from 0.2 μg L−1 to 50 μg L−1 and a 2-fold enrichment factor (from 60 μL sample solution to 30 μL eluent) were achieved. The proposed method was further validated by analyzing CEA in human serum. The results were in good agreement with those obtained by chemiluminescent immunoassay, which is currently used as a clinical method. Overall, this method offers the advantages of high speed, high sensitivity, high selectivity, low sample/reagents consumption, high integrity and versatility. Moreover, it can be easily applied to other biological and medical assays.
研究领域:
分析化学
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生物医学工程
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临床检验
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Yubin Yuan,Shujing Zhao,Qiang Wu,Zifan Li,Chuanyu Han,Xin Li,Long Hu,Mingchao Yang,Weihua Liu,Li Geng
Biological perception systems are renowned for their ability to process environmental stimuli with remarkable energy efficiency, primarily through spike-based communication and event-driven mechanisms. Inspired by these, in this paper, we propose an infrared artificial neuromorphic perception neuron (IR-ANPN) designed to detect infrared (IR) light, enabling sensory perception beyond the visible spectrum. The IR-ANPN is designed based on a one-transistor-one-memristor (1T1M) architecture, which consists of a PbS quantum dots-decorated Indium Gallium Zinc Oxide (IGZO) thin film transistor (PbS-QDs/IGZO TFT) and an NbO x Mott memristor. The PbS-QDs/IGZO TFT is responsible for detecting infrared light stimuli, while the NbO x Mott memristor converts these stimuli into neuromorphic spikes. The IR-ANPN can operate in an event-driven mode, which means it transmits spikes only when exposed to IR light, ensuring energy efficiency by remaining dormant in the absence of relevant stimuli. The paper also showcases the potential of the IR-ANPN by constructing a neuromorphic infrared detection array. Combined with a spiking neural network (SNN), the system achieves 92 % recognition accuracy on the MNIST dataset by encoding pixel intensity as spiking frequency. The IR-ANPN architecture enhances sensory capabilities through a neuromorphic approach, enabling the detection of non-visible wavelengths with remarkable energy efficiency and laying the foundation for future intelligent sensing technologies.
研究领域:
神经形态工程
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红外传感
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忆阻器器件
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光电子学
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人工智能硬件
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiqi Chen,Jinyong Hu,Pei Chen,Mengqi Yin,Fanpu Meng,Yong Zhang
Transition metal dichalcogenides (TMDs) have blazed a novel trail in the field of NO 2 gas detection owing to the unique photoelectric properties and prospective gas sensing performance especially working at low operating temperature. However, the incomplete recoverability and susceptibility to humidity at room temperature restrict the practical applications of TMDs-based gas sensors. Herein, we demonstrate a fully recoverable WS 2 based gas sensor with enhanced anti-humidity ability by combining the decoration of zero-dimensional PbS nanoparticles and the assistance of UV light. Through the control over the molar ratio of WS 2 /PbS, the optimized WS 2 /PbS (the molar is 10:1) gas sensor exhibits a remarkable elevated recovery rate from 33.4% to 99.8% with almost no baseline drift as compared to that in the pure WS 2 gas sensor. More importantly, attributing to the irradiation of UV can accelerate the desorption of water molecules, WS 2 /PbS heterostructure based gas sensor manifests more stabilized anti-humidity performance with stable initial resistance and negligible response value drift (8.8%) in the range of 10%–90% relative humidity. Furthermore, UV-assisted WS 2 /PbS gas sensor also possesses prominent sensing performances including high sensitivity, low detection limit (∼20 ppb), favorable selectivity and outstanding long-term stability. This research will pave the way on designing high-performance TMDs-based gas sensors operating at room temperature.
研究领域:
材料科学
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纳米科技
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传感器技术
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环境监测
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半导体物理
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表面化学
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光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Zhigang Yin,Longhua Xu,Jianyong He,Houqin Wu,Shuai Fang,Sultan Ahmed Khoso,Yuehua Hu,Wei Sun
Herein, we employed a range of instrumental techniques to investigate the performance of l -cysteine as a biodegradable and selective depressant in the flotation separation of molybdenite (MoS 2 ) from galena (PbS), demonstrating that this amino acid exhibited a superior depressing efficiency toward PbS and enabled the separation of the above minerals under alkaline conditions. In the presence of l -cysteine, the zeta potentials of PbS shifted to more negative values, which was indicative of chemisorption . Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy measurements indicated that the above chemisorption involved the formation of a five-membered chelate ring via coordination of Pb by S (–SH) and N (–NH 2 ) atoms, as was further confirmed by time-of-flight secondary ion mass spectrometry measurements. Moreover, the detection of l -cysteine dimer on the surface of PbS was ascribed to the occurrence of oxidation processes. The predicted adsorption modes suggested an appreciable extent of surface interaction between l -cysteine and PbS, whereas density functional theory calculations demonstrated that the interaction between l -cysteine and the PbS (100) slab corresponds to both physical and chemical adsorption.
研究领域:
矿物加工工程
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表面化学
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）