CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Mengru Geng,Jiaqi Zhao,Jie Li,Boyue Liu,Ruiming Liu,Xiaojuan Wang,Wanlong Song,Mingzhe Shao,Yihao Luan,Qun Li,Meng Gao,Fengshan Zhang,Xiaosen Pan,Ning Ma,Guigan Fang
Hydrophilic cellulosic materials exhibit extraordinary effectiveness on sensitivity of humidity. However, the fibril network in fiber walls hinders both permeability and desorption of water, resulting in to weak their responsiveness and recoverability to humidity. Here, structural optimization is achieved by modulating interfacial bonding, resulting in an unprecedented increment in the response-recovery speed of cellulosic humidity sensors. Precisely, hydrolyzable thiol silane is introduced between cellulose nanofibers and carbon nanotubes for a covalent interface, which promotes a dense structure under evaporation induction (76.33 % reduction in thickness), avoiding the deep penetration of water. In addition, Cs 2 SnCl 6 perovskites are loaded by means of strong coordination to boost the chemical dissociation of water molecules, further enhancing the responsiveness and sensitivity of devices. The as-prepared sensor exhibits excellent response/recovery speed (1.8 s / 2.9 s) between 11 % RH to 95 % RH, which is ahead of cellulosic humidity sensors developed in the past three years, as well as satisfactory sensitivity (5.35 × 10 6 %), hysteresis (< 1 % RH), and stability (over 90 days). For application purposes, skin moisture, breathing patterns, and word syllables can be accurately identified. Moreover, it can monitor respiratory rate and amplitude stably during long-term exercise, indicating remarkable potential in human physiological humidity monitoring.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Sibo Zhao,Hongchen Qiu,Linjing Jing,Yingtong Guo,Mingliang Li,Gang Shao,Bingbing Fan,Hailong Wang,Hongliang Xu,Hongxia Lu
The problem of low stability and high lead content limit the commercial development of halide perovskite . In this paper, the high-energy ball milling is used to rapidly and efficiently synthesize high-entropy Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Yb 1/5 )Cl 3 quantum dots (QDs), the introduction of high-entropy and rare earth ions reduces lead content, increases mixing entropy, and synergistically enhances the photoluminescence (PL) intensity and stability of QDs with other ions. Because the increase of entropy enhances the stability, the QDs still have 70 % PL intensity after 60 days of placement. After the QDs are exposed to the ultraviolet lamp for 8 hours, the PL intensity maintains at 67.1 % due to the loss of ligand. Ionic bonds are easily broken in water, so after soaking in water for 8 hours, the PL intensity of the QDs keeps at 32 %. The thermal stability of QDs is maintained well because of physical and chemical stability of rare earth ions. Since ethanol dissolves the ligands on the surface of the QDs, the non-radiative recombination is enhanced, so the PL intensity of QDs remains at 59 % after soaking for 8 hours. This paper provides a new way that further enhances the stability and solves high lead content of all-inorganic perovskite materials.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
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IF 7.7
XianWei Wang,Yue Zhai,Yuanhui Chen,Wei Zhang,Pei Liang,Qiangqiang Zhu,Hong Zhang,Juan Kang,Le Wang
s The development of a highly sensitive and reliable surface-enhanced Raman scattering (SERS) substrate is crucial for overcoming the limitations in its practical applications. Herein, a novel 3D waffle-like SERS substrate with high activity is constructed for detecting trace amounts of myricetin in complex analytes extracted from green tea. The substrate is achieved through a layered ternary film structure, where ordered poly (methyl methacrylate) opal photonic crystals (PMMA OPCs) serving as a 3D hot spots template and enhancing the performance of CsPbBr 3 film that facilitates efficient charge transport, and an Au film covered over the CsPbBr 3 film modulating the vibronic coupling and providing plasmonic hot spots. The PMMA-CsPbBr 3 -Au substrate exhibits a low detection limit of 10 −10 M with an 8.9 × 10 7 enhancement factor, signal repeatability and stability for R6G molecules. Furthermore, the SERS detection of myricetin content in Longjing green tea from different years is carried out, and the results show a good linear positive correlation with storage years (R 2 =98.2 %), demonstrating the potential application of 3D substrate for sensitive and reproducible SERS.
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Materials Horizons
·
2025
·
IF 10.7
Jianhui Zhao,Yunsong Di,Yuhang Sheng,Jiaxin Sui,Xingru Yang,Yi Zhang,Ying Wang,Haoyu Wang,Xiaowei Zhang,Liyan Yu,Zhihui Chen,Zhixing Gan
Given that optical thermometers are widely used due to their unique advantages, this study aims to address critical challenges in existing technologies, such as insufficient sensitivity, limited temperature measurement ranges, and poor signal recognition capabilities. Herein, we develop a thermometer based on the fluorescence intensity ratio (FIR) of Sb-doped Cs2NaInCl6 (Cs2NaInCl6:Sb). As the temperature increases from 203 to 323 K, the thermally induced transition from triplet to singlet self-trapped excitons (STEs) leads to enhanced 455 nm photoluminescence (PL) from singlet STE recombination. Thus, the FIR monotonically depends on temperature, allowing for temperature sensing with a high absolute sensitivity (SA) of 0.0575 K−1 and the maximum relative sensitivity (SR) of 1.005% K−1. We demonstrate that spatial temperature distribution can be measured by mapping the PL spectra, even with a transparent medium screening the target. Furthermore, blue emissive Cs2NaInCl6:Sb is mixed with yellow emissive Cs2AgInCl6:Sb with a thermal quenching feature. The fluorescence color of the mixture dramatically depends on temperature, enabling a user-friendly colorimetric temperature sensing. Therefore, two operational modes are proposed to meet various practical application demands.
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Laser & Photonics Reviews
·
2024
·
IF 9.8
Xin Liu,Guangming Niu,Jutao Jiang,Li Che,Laizhi Sui,Xiaowei Wang,Xiangyu Zeng,Guorong Wu,Kaijun Yuan,Xueming Yang
Lead-free halide double perovskites (DPs) have attracted much attention due to their potential applications in the field of near-infrared (NIR) optoelectronics. However, regulating the NIR luminescence properties of such materials remains a challenge. In this study, it is found that Cs 2 AgInCl 6 :Cr 3+ DPs exhibit a broad NIR emission under ultraviolet excitation, with a peak value of 980 nm. In the range of 9 GPa, the emission intensity increases significantly. As the pressure increases, a transition from broadband NIR emission to narrow-line emission occurs, accompanied by a decrease in the full width at half maximum (FWHM) from 260 to 40 nm, attributed to increased local structural asymmetry and enhanced crystal field around Cr 3+ ions. Ultrafast transient absorption experiments reveal the changes of energy transfer under pressure and the emergence of new radiation channels, demonstrating the dynamic evolution of emission characteristics under high pressure. The research results deepen the understanding of high pressure luminescence in Cr 3 ⁺-doped halide DPs, providing strategies for designing highly efficient NIR emitters in metal halide DPs.
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Chemistry-An Asian Journal
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2024
·Vol. 19
·期 15
·e202400447
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IF 3.5
Bingqi Wang,Pan Liu,Alberto J. Fernández-Carrión,Hui Fu,XiuHui Zhu,Xing Ming,Weixiong You,Zongliang Xiao,Mingxue Tang,Xiuyun Lei,Congling Yin,Xiaojun Kuang
The In-based double perovskite halides have been widely studied for promising optical-electric applications. The halide hexagonal perovskite Cs 2 LiInCl 6 was isolated using solid-state reactions and investigated using X-ray diffraction and solid-state NMR spectra. The material adopts a 12-layered hexagonal structure (12 R ) consisting of layered cationic orders driven by the cationic charge difference and has Li + cations in the terminal site and In 3+ in the central site of face-shared octahedron trimers. Such a cationic ordering pattern is stabilized by electrostatic repulsions between the next-nearest neighboring cations in the trimers. The LiCl 6 octahedron displays large distortion and is confirmed by 7 Li SS NMR in the Cs 2 LiInCl 6 . The Cs 2 LiInCl 6 material has a direct bandgap of ~4.98 eV. The Cs 2 LiInCl 6 : Mn 2+ displays redshift luminescence (centered at ~610–622 nm) from the substituted Mn 2+ emission in octahedron with larger PLQY (17.8 %–48 %) compared with that of Cs 2 NaInCl 6 : Mn 2+ . The Mn-doped materials show luminescent concentration quenching and thermal quenching. The composition Cs 2 Li 0.99 In 0.99 Mn 0.02 Cl 6 exhibits the highest PL intensity, a maximum PLQY of 48 %, and high luminescent retention rate of ~86 % below 400 K and is suitable for application for pc-LED. These findings contribute to our understanding of the chloride perovskites and hold potential for widespread optical applications.
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Materials Today Communications
·
2024
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IF 3.7
Yudong Xu,Saisai Chen,Mengru Xu,Yaran Wen,Zhenyu Yan,Yuanyuan Yan,Tianyu Zhang,Tong Zhu,Zhixu Qin,Fabao Zhang
A lead-free double perovskite material is being considered as a substitute for lead-based perovskites due to its promising benefits in the photocatalytic degradation of organic dyes. In this study, Cs 2 AgBiCl 6 , a A 2 BB’X 6 -structured halide double perovskite, was prepared by one-step grinding method and hydrochloric acid precipitation method, respectively, and was used to degrade organic dyes in an ethanol solution under visible light. It is shown that the nano-sized Cs 2 AgBiCl 6 sample prepared by the one-step grinding method (Cs 2 AgBiCl 6 -G) can degrade 98 % of Sudan Red III within 10 min, which is highly comparable with the sample prepared using the hydrochloric acid precipitation method (Cs 2 AgBiCl 6 -P). Cyclic experiments demonstrated that Cs 2 AgBiCl 6 -G exhibited superior cyclic catalytic performance compared to the Cs 2 AgBiCl 6 -P samples. In addition, the former also exhibited better photocatalytic degradation for methyl orange, rhodamine B, and methylene blue. This indicates that this facile one-step grinding method can be utilized a large-scale effective preparation technique for producing high yield, eco-friendly, highly efficient and stable Cs 2 AgBiCl 6 photocatalyst.
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Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 20
·7098-7109
·
IF 6.1
Fengmei Zhu,Yuan Gao,Jianbei Qiu
Presently, there is a need to expand the near-infrared (NIR) emission range, especially in the bio-transparent window, to improve the internal quantum efficiency and external quantum efficiency, and to minimize the shortcomings of luminescence properties. In this work, an ultra-broadband NIR emission Cr3+-doped Cs2NaLuCl6 all-inorganic metal halide perovskite phosphor was synthesized by a grinding–sintering method. Under 300 nm excitation, Cs2NaLuCl6:Cr3+ phosphors exhibited ultra-broadband NIR emission of 800–1400 nm, which covers nearly the entire NIR-I (700–1000 nm) and NIR-II (1000–1400 nm) regions; the emission peaked at around 960 nm, with a full width at half maximum of ∼182 nm. Noticeably, the internal- and external-quantum efficiencies of the optimized Cs2NaLuCl6:Cr3+ phosphor were as high as ∼92.9% and ∼60.75%, respectively. We showed through analysis and simulation that the weak crystal field strength is conducive to increasing the odd term of the crystal field, and therefore it partially released the restriction imposed by the parity prohibition law and improved the energy absorption efficiency of Cr3+. As the size of the phosphor approaches the wavelength of NIR luminescence, the apparent Mie scattering effect starts to take effect, which enhances the light extraction of NIR luminescence in the radial direction.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Deyuan Yang,Ruirui Cui,Chaoyong Deng
Recently, the splendid strategy of co-doping ns2 electron configuration ions with rare-earth ions in all-inorganic lead-free halide double perovskites has been proposed to overcome the weak absorption cross-section of the f–f transition of rare-earth ions and achieve efficient white emission. But few of them can really provide effective red emission in lead-free halide double perovskites, despite the wide variety of rare-earth ions, and lead-free halide double perovskites with co-doping rare-earth ions and doping ns2 electron configuration ions usually exhibit an unsatisfactory color rendering index due to the narrow characteristic emission peaks of rare-earth ions. To address this issue, Mn2+ ions with red wide peak emission were introduced into Cs2NaScCl6 simultaneously with Tb3+ ions and Sb3+ ions in this work. The white light emission was observed in Cs2NaScCl6:0.01Sb3+,0.12Tb3+,0.07Mn2+ under 336 nm excitation because the presence of energy transfer from Sb3+ ions to Mn2+ and Tb3+ ions enhances fluorescence performances of Mn2+ and Tb2+. The temperature-dependent spectrum of Cs2NaScCl6:0.01Sb3+,0.12Tb3+,0.07Mn2+ shows that it exhibits a stable white emission in the temperature range of 298–398 K, and it's emission intensity at 398 K only decreases by less than 18% of the initial intensity (at 298 K). Excitingly, WLED devices with a quite high color rendering index of 93.6, which is one of the best in lead-free halide double perovskites, and nearly standard white light CIE coordinates of (0.3425, 0.3435), have been fabricated by using Cs2NaScCl6:0.01Sb3+,0.12Tb3+,0.07Mn2+ and a 340 nm LED chip and can maintain a good white color stability at different working times and currents. These results indicate that Cs2NaScCl6:Sb3+,Tb3+,Mn2+ is an outstanding candidate for WLED applications.
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Journal of Materials Chemistry C
·
2024
·Vol. 13
·期 1
·456-464
·
IF 5.7
Xiaoman Zhang,Yehua Zheng,Kun Nie,Xiaodong Zhang,Xiuqiang Duan,Ziyao Hu,Ming Yang,Lefu Mei,Luoxin Wang,Hua Wang,Mingquan Li,Xiaoxue Ma
Lead-free double perovskites are environmentally friendly, and their good photoelectric efficiency has received widespread attention. However, the stability and efficiency of lead-free perovskites need to be further improved to meet the growing application needs. In this study, thermally quenched perovskite (Cs2NaHoCl6) crystals (PCs) were successfully synthesized by co-precipitation. By doping with Sb3+, the excitation wavelength of the original perovskite increased significantly to 250–360 nm, and the emission wavelength of the original perovskite also increased significantly to 660 nm. Cs2NaHoCl6:Sb3+ PCs are made of red and white light-emitting diodes (LEDs) for general lighting applications. In addition, Cs2NaHoCl6:Sb3+ PCs are made into flexible luminescent fibers with aramid/polyphenylene sulfide (ACFs/PPS) composite fibers. Based on the good thermal quenching resistance of Cs2NaHoCl6:Sb3+ PCs, the flexible luminescent fibers showed excellent high-temperature luminescence stability. At 125 °C, flexible luminescent fibers retained 99.8% of the original luminescence intensity; at 250 °C, they retained 75.6% of the original. These flexible luminescent fibers have the potential to be used in fluorescence detection in high-temperature environments. In summary, this study used a simple method to prepare lead-free perovskites with good optical properties and stability, expanding the application of perovskites in the field of fibers.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Lin Cheng,Si-Yu Li,Yu-Jie Zhang,Xin Meng,Ying Wang,Shuaihua Wang,Kai-Yao Wang
Innovation of 137 Cs + and 90 Sr 2+ ion exchangers is achieved through heteroatom-bridged integration of polyoxovanadate clusters, whose soft Lewis basic nature and large size promote the selective capture of cesium/strontium radionuclides. The radiolytically stable Na 6 P 4 V 10 O 34 ·19H 2 O ( VPO-1 ) features an interlinkage of {NaV 10 O 26 } clusters and phosphorus bridges, forming nanoscale voids with hydration-lubricated sodium ions. This structure endows VPO-1 with remarkable exchange kinetics ( k 2 Cs = 3.774 g mg −1 min −1 ; k 2 Sr = 1.376 g mg −1 min −1 ), equilibrium removal ( R > 99.3% within 5–10 min), and maximum capacities ( q m Cs = 300.32 mg g −1 ; q m Sr = 113.00 mg g −1 ). The exchange mechanism is illuminated through single-crystal XRD by revealing cluster-vacancy pathways and ionic-radius-dependent adsorption sites. VPO-1 exhibits stability across pH = 3–12, with exceptional K d Cs and K d Sr values above 10 5 mL g −1 , and high selectivity for Cs + and Sr 2+ over various competing ions. These properties enable excellent column filtration performance ( R = 99%–100%) for mixed Cs + and Sr 2+ during a 3000 mL test. Deep cleaning of these ions is also possible via suction filtration using an ultra-thin VPO-1 /PTFE membrane, with high exchange activity ( R = 98.8%–99.9%) retained after simple regeneration with 2 m NaCl, offering significant potential for nuclear wastewater treatment applications.
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Nano Research
·
2024
·
IF 9.5
Yang Xingru,Sheng Yuhang,Zhang Linglong,Yang Lun,Xing Fangjian,Di Yunsong,Liu Cihui,Hu Fengrui,Yang Xifeng,Yang Guofeng,Liu Yushen,Gan Zhixing
Luminescent materials with multi-emission features are difficult to be replicated, which are highly desirable for advanced anti-counterfeiting. Here, we report the pioneering synthesis of Mn 2+ /Yb 3+ /Er 3+ tri-doped Cs 2 Ag 0.8 Na 0.2 InCl 6 double perovskites (MYE-DP), which exhibit photoluminescence (PL) covering from visible to near-infrared (NIR). The PL colors under excitations of 254 and 365 nm are notably different due to the changed relative emission intensities of self-trapped excitons (STEs) and Mn 2+ d–d transition. Moreover, under the excitation of a NIR laser, the MYE-DP exhibits upconversion (UC) emissions of Mn 2+ and Er 3+ . After ceasing the excitation, the long-lived trapped electrons can be thermally released to Mn 2+ and Er 3+ ions, resulting in both visible and NIR afterglow. Based on multi-modal emissions of the MYE-DP, we demonstrate a five-level anti-counterfeiting strategy, which significantly increases the anti-counterfeiting security. In addition, this work provides valuable insights into the energy transfer between STEs, Mn 2+ , Ln 3+ , and traps, laying a solid foundation for future development of new lead-free perovskites.
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