Nature Communications
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2021
·Vol. 12
·期 1
·1-11
·
IF 14.919
Liang Zeyu,Wang Qiyue,Liao Hongwei,Zhao Meng,Lee Jiyoung,Yang Chuang,Li Fangyuan,Ling Daishun
Histopathological level imaging in a non-invasive manner is important for clinical diagnosis, which has been a tremendous challenge for current imaging modalities. Recent development of ultra-high-field (UHF) magnetic resonance imaging (MRI) represents a large step toward this goal. Nevertheless, there is a lack of proper contrast agents that can provide superior imaging sensitivity at UHF for disease detection, because conventional contrast agents generally induce T2 decaying effects that are too strong and thus limit the imaging performance. Herein, by rationally engineering the size, spin alignment, and magnetic moment of the nanoparticles, we develop an UHF MRI-tailored ultra-sensitive antiferromagnetic nanoparticle probe (AFNP), which possesses exceptionally small magnetisation to minimize T2 decaying effect. Under the applied magnetic field of 9 T with mice dedicated hardware, the nanoprobe exhibits the ultralow r 2 / r 1 value (~1.93), enabling the sensitive detection of microscopic primary tumours (<0.60 mm) and micrometastases (down to 0.20 mm) in mice. The sensitivity and accuracy of AFNP-enhanced UHF MRI are comparable to those of the histopathological examination, enabling the development of non-invasive visualization of previously undetectable biological entities critical to medical diagnosis and therapy.
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ACS Applied Nano Materials
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2021
·
IF 5.097
Su You,Li Zhang,Yongqiang Yu,Wanqun Zhang,Huanran Li,Jie Meng,Qunxiang Li,Qing Yang
Group I–III–VI2 semiconductors are promising for the fabrication of electronic and photoelectronic devices because of their tunable band gaps and intensive absorption in visible and near-infrared regions. Here, ternary AgInTe2 nanostructures have been synthesized via a facilely designed solution-phase procedure at 240–280 °C from AgNO3 and In(acac)3 in oleylamine reacted with TeO2 dissolved in 1-dodecanethiol. They illustrate truncated quasitetrahedrally geometrical shapes from the phosphine-free solution synthetic route and could be spin-coated on silicon wafer to set up a vertical AgInTe2/Si heterojunction-based photodetector. The device is highly sensitive to visible and near-infrared illuminance and has remarkable photoresponsive properties with an on/off switch ratio of 780 at a reverse bias of −5 V, a high responsivity (2.82 A W–1), specific detectivity (8.12 × 1011 Jones), and a low noise equivalent power (2.46 × 10–13 W Hz–1/2) at a bias of −2 V. Especially, the device exhibits fast response speeds (τrise = 5.2 μs, τfall = 18.4 μs), which would be a vital figure of merit for its technical application. The present work offers an available strategy for the tunable synthesis of ternary and even multiple-component tellurides beyond the demonstrated high-quality AgInTe2 nanostructures and would provide a simplified way to heterostructure-based photodetectors with high-responsivity and fast-speed performances.
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Frontiers in Bioengineering and Biotechnology
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2021
·
IF 5.89
Yang Shengnan,Yang Yiling,Yang Yi,Zhao Xiangya,Wang Qian,Li Bing,Dong Ling,Tian Rui,Bao Zhirong
Radiotherapy is recommended as a modality for cancer treatment in clinic. However, cancerous cells were resistant to therapeutic irradiation due to its DNA repair. In this work, single-walled carbon nanotubes with unique physical properties of hollow structures and high specific surface area were introduced as carrier for iron-palladium (FePd) to obtain iron-palladium decorated carbon nanotubes (FePd@CNTs). On one hand, FePd nanoparticles possess significant ability in radiosensitization as previously reported. On the other hand, carbon nanotubes offer higher efficiency in crossing biological barriers, inducing the accumulation and retention of FePd nanoparticles within tumor tissue. In order to verify the radiosensitization effect of FePd@CNTs, both in vitro and in vivo experiments were conducted. These experiments showed that the FePd@CNTs exhibited remarkably better radiosensitization effect and more obvious accumulation than FePd NPs, suggesting a potential of FePd@CNTs in radiosensitization.
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ACS Omega
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2021
·
IF 3.512
Yu Ji,Jian-Bin Zhang,Hao-Ran Shen,Zhan Su,Hao Cui,Tao Lan,Jia-Qian Wang,Yu-Hui Chen,Lihui Liu,Kun Cao,Wei Shen,Shufen Chen
The wide application of CsPbI3 nanocrystals (NCs) is limited due to their poor phase stability. We reported that Mn2+-CsPbI3 NCs have better optical performance and phase stability. With a suitable Mn/Pb ratio (5.0%), Mn2+-doped α-CsPbI3 NCs exhibited the best stability under UV irradiation, ethanol addition, and heating. Under UV irradiation and addition of ethanol, photoluminescence (PL) intensities of CsPbI3 NCs could be only preserved up to 35% (22 min UV irradiation) and 10% (ethanol addition), respectively, whereas, Mn2+-doped CsPbI3 (5.0%) exhibited much improved stability, and their intensities could be preserved up to 70% (22 min UV) and 58% (ethanol), respectively. It should be noted that crystal-phase stability could be maintained at least 7 h even at 120 °C. We believe that the improved stability in extreme conditions for α-CsPbI3 NCs can be further applied to optoelectronic devices.
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Journal of Physical Chemistry C
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2021
·
IF 4.126
Rui Han,Qian Zhao,Jian Su,Xiaojun Zhou,Xiaofang Ye,Xiaojuan Liang,Juan Li,Hongkun Cai,Jian Ni,Jianjun Zhang
The best research-cell efficiency for quantum dot solar cells has boosted from 11.6 to 18.1% within 5 years due to the evolution of perovskite quantum dots (PQDs) that are being intensively developed along with the flourishing of perovskite thin-film photovoltaics. During the fabrication of PQD devices, as far as we know, methyl acetate (MeOAc) is an ineluctable solvent in ligand exchange for producing highly efficient solar cells. Nevertheless, the reproducibility for PQD solar cells using MeOAc treatment is poor since it has to make a trade-off between removing long-chain organic ligands for high charge transport and keeping them for the stabilization of the black crystal phase. Herein, we demonstrate the degree of MeOAc treatment on CsPbI3 PQD solid films in detail and clarify that MeOAc treatment is able to not only remove the oleyl ligands for promoting the charge transport but also passivate the surface defects in the CsPbI3 PQD solid films. It is noted that immoderate MeOAc treatment could induce the formation of the δ-phase, leading to the degradation of device performance. After locating the balance for MeOAc treatment, the CsPbI3 PQD solar cells are fabricated and optimized without using any additional modifications except MeOAc treatment, and these additive-free devices possess a conversion efficiency surpassing 12%.
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Journal of Materials Chemistry C
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2021
·Vol. 9
·期 27
·8537-8544
·
IF 7.393
Zhongyuan Guan,Haihang Ye,Peiwen Lv,Lijin Wang,Jing Zhang,Bin Zou,Aiwei Tang
Multinary Cu-based chalcogenide nanocrystals (NCs) are excellent candidates for optoelectronic applications, but their growth mechanism and its impacts on the NCs’ optical properties remain controversial. Herein, we employed a simple colloidal chemistry method for the growth of multinary Cu-based NCs including ternary Cu–In–S NCs, quaternary Cu–In–Se–S NCs, and five-component Cu–In–Zn–Se–S NCs, to explore their growth mechanism and investigate their optical properties. It is found that the ternary Cu–In–S NCs contain a large number of copper vacancies, which affect the major acceptor level for the exciton recombination. With the high reaction activity of Se, the quaternary Cu–In–Se–S NCs form at low reaction temperature and have a red-shift of the photoluminescence (PL) maximum due to the recombination from the conduction band to the acceptor level. The formation process of five-component Cu–In–Zn–Se–S NCs highly depends on the Zn amount, which shows a competitive relationship between the NCs’ growth and diffusion of Zn, leading to the red- and blue-shift of PL maximum, respectively. Our study provides a clear map for the growth of multinary Cu-based NCs and shows their impacts on optical properties.
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JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Yanxia Yu,Yufeng Zhou,Yujie Zhang,Yaqian Zhang,Xiaodong Liu,Xiaojuan Liang,Jianping Liu,Suqin Chen,Weidong Xiang
All inorganic CsPbX 3 (X = Cl, Br, I) perovskite quantum dots (QDs) have been widely reported. However, the poor stability of CsPbX 3 QDs limits their application in the field of optoelectronics . In this work, CsPbX 3 QDs were prepared by the hot injection strategy. We compounded CsPbX 3 QDs with mica to improve stability. A series of novel CsPbX 3 @mica composites with high thermal stability and light radiation stability were successfully fabricated and the narrow full width at half maximum (FWHM) of blue, green and red emissions are ~17 nm, ~21 nm and ~37 nm, respectively. What's more, the photoluminescence quantum yield (PLQY) of CsPbBr 3 @mica composite is 38.5%. Notably, the white light-emitting diodes (wLED) device can be manufactured by coupling the red-emitting CsPbBr 1 I 2 @mica composite material and commercial phosphor YAG: Ce 3+ with the InGaN chip to produce bright natural white light. Meanwhile, CsPbX 3 @mica composites can be used as color conversion materials to construct a LED device, which exhibits a wide color gamut covering up 115.7% of National Television System Committee (NTSC). This present work provided novel CsPbX 3 @mica composites and could bring the potential inspiration in backlit display and lighting applications.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Maosheng Chen,Xu Zhang,Chunhua Luo,Ruijuan Qi,Hui Peng,Hechun Lin
Waterborne polymers are advantageous in terms of cost, convenience, sustainability, and environmental friendliness. As lead halide perovskite (LHP) nanocrystals suffer from fast degradation in the presence of water, it is challenging to encapsulate LHP nanocrystals in waterborne polymers. In this work, luminescent MAPbBr3@PbBr(OH) nanocrystals were synthesized via the aqueous grinding process in the presence of 2-methyl-imidazole (2-MIM) and oleylamime (OAm). 2-MIM triggers the formation of the PbBr(OH) matrix, and OAm acts as a size-control ligand to control the size of MAPbBr3@PbBrOH particles in the nanoscale range. Highly stable waterborne luminescent inks were successfully prepared by blending MAPbBr3@PbBr(OH) nanocrystals with waterborne polymers, including poly(vinylpyrrolidone), poly(vinyl acetate), and acrylate resins. Owning to the dual protection of the polymer matrix and PbBr(OH) to LHP quantum dots (QDs), the luminescent films exhibit excellent stability to the environment under thermal and light irradiation. The ink can be used as a phosphor to fabricate down-converting green and white light-emitting diodes (LEDs). Waterborne anticounterfeiting inks suitable for screen printing were prepared via formula tuning for the anticounterfeit purpose. The anticounterfeiting luminescent patterns can be screen printed on paper, cloth, and poly(ethylene terephthalate) (PET), with encryption and decryption of information being accurately and conveniently realized by switching UV irradiation.
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Sustainable Energy & Fuels
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2021
·Vol. 5
·期 14
·3598-3605
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IF 6.367
Tangxi Chen,Min Zhou,Wen Chen,Yuyao Zhang,Siyong Ou,Yueli Liu
Halide perovskite quantum dots (HP QDs) have been widely used in the field of photocatalysis due to their excellent performance. However, the issues of lead toxicity and instability prevent their process in the photocatalysis application. Herein, the lead-free Cs2AgInCl6 perovskite quantum dots (CAIC QDs) are synthesized by the hot-injection method, and CAIC QDs@Ag composites with various Ag loading amounts are self-assembled by adjusting the Cl source in the synthesis process, which is used to improve the CO2 photoreduction efficiency by using the surface plasmon resonance (SPR) effect of Ag nanoparticles. In addition, the surface ligand density of CAIC QDs@Ag composites is regulated by the purification processing treatment to release the influence of organic ligands on the charge transport performance. It is found that the CAIC QDs@Ag composite with the optimal ligands density possesses fast electron transport and effective carrier separation efficiency, which are crucial for the improvement of the photocatalysis reaction. As a result, the CAIC QDs@Ag-2 composite after purification processing achieves the highest yield of 26.4 μmol g−1 and 28.9 μmol g−1 for CO and CH4, respectively, during the CO2 photoreduction process. In addition, there is no significant decline of CO2 photoreduction performance after the photocatalysis cycling test for 9 h, indicating the good stability of the CAIC QDs@Ag composite in the photocatalysis process.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Shaoda Huang,Shuanglong Lu,Hongyin Hu,Fangping Xu,Huining Li,Fang Duan,Han Zhu,Hongwei Gu,Mingliang Du
Although attentions have been devoted to developing Pd-based bimetallic nanocrystals towards the electrocatalytic oxygen reduction reaction (ORR) and ethanol oxidation reaction (EOR), the engineering of efficient bifunctional electrocatalysts with high atomic utilization still faces big challenges. Herein, we reported a facile one-pot template-free route to fabricate three-dimension hyper-dendritic PdZn nanocrystals (HD-PdZn NCs) that regulated by gas mixtures of carbon monoxide and hydrogen. The developed catalysts acted as robust bifunctional electrocatalysts for cathodic ORR and anodic EOR. Specifically, the engineered HD-PdZn NCs not only displayed superior mass activity (MA, 0.461 A mg Pd -1 ) and specific activity (SA, 0.393 mA cm −2 ) at 0.9 V, which were 5.2 and 5.0 times of commercial Pt/C, respectively, but also showed enhanced stability with only 3% loss of MA after 10,000 cycles for ORR. Density functional theory (DFT) calculations revealed the Zn implantation could facilitate the reduction of OOH* to OH* on the surface of Pd during the ORR process. Moreover, HD-PdZn NCs exhibited the highest EOR mass activity with a value of 3.45 A mg Pd −1 among benchmarked catalysts in alkaline solution. The advantageous structural features and electron effects are proposed to be responsible for the remarkable bifunctional activities. This work illustrates a facile method to fabricate highly efficient bifunctional electrocatalyst for energy conversation application.
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Coatings
·
2021
·Vol. 11
·期 5
·581
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IF 2.881
Linyuan Lian,Youyou Li,Daoli Zhang,Jianbing Zhang
InP quantum dots (QDs) are promising down-conversion phosphors for white light LEDs. However, the mainstream InP QDs synthesis uses expensive phosphorus source. Here, economic, in situ-generated PH3is used to synthesize InP QDs and a two-step coating of ZnS shells is developed to prepare highly luminescent InP/ZnS/ZnS QDs. The QDs show a photoluminescence quantum yield as high as 78.5%. The emission can be tuned by adjusting the halide precursor and yellow emissive InP/ZnS/ZnS QDs are prepared by judiciously controlling the synthetic conditions. The yellow QDs show suppressed thermal quenching and retain >90% room temperature PL intensity at 150 °C for the growth solution. Additionally, the PL spectrum matches with the eye sensitivity function, resulting in efficient InP QD white light LEDs.Keywords:InP;quantum dots;core/shell;InP/ZnS;thermal quenching
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Nanoscale
·
2021
·Vol. 13
·期 21
·9740-9746
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IF 7.79
Dongdong Yan,Qionghua Mo,Shuangyi Zhao,Wensi Cai,Zhigang Zang
With a high photoluminescence quantum yield (PLQY) being able to exceed 90% for those prepared by the hot injection method, CsPbBr3 quantum dots (QDs) have attracted intensive attention for white light-emitting diodes (WLEDs). However, the whole process is carried out in a 3-neck flask via air isolation and at a relatively high temperature. In addition, CsPbBr3 QDs suffer from poor stability under ambient atmosphere. In this work, an effective strategy through doping of Sn2+ ions at room-temperature is proposed to improve the emission efficiency and stability of CsPbBr3 QDs. Compared with pure CsPbBr3 QDs, a higher PLQY and a better stability are obtained. The detailed physical mechanism for this performance enhancement is discussed and described. An optimum result is found at an Sn2+ doping amount of 20%, which shows a high PLQY of 82.77%. WLEDs based on these 20% Sn2+ doped CsPbBr3 QDs are also studied, exhibiting a high color rendering index of 89 and a correlated color temperature (CCT) of 3954. The method proposed here provides an effective strategy to enhance the fluorescence and stability of CsPbBr3 QDs, which might have promising potential in the lighting fields.
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