SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Yongyun Mao,Yibo Gao,Shanshan Wu,Siying Wu,Jiayan Shi,Bingpu Zhou,Yanqing Tian
In this work, we presented a facile and cost-effective approach to fabricate novel PtTFPP/PDMS micro-pillar array (MPA) sensor film with I 0 /I 100 for gaseous oxygen and dissolved oxygen are 288 and 84, respectively. The sensitivity of the sensor film exhibited over ∼30-fold increment when compared with contemporary PtTFPP/PDMS-based oxygen sensors. The detection limit was as low as 0.10 μmol/L, which means that the ultrasensitive sensor films enable reliable monitoring of dissolved oxygen (DO) within nanomolar concentration ranges that are particularly difficult to achieve in previous works. Furthermore, the remarkably light intensity-changing characteristic of the sensing film under lower O 2 partial pressures facilitates convenient identification of O 2 concentrations even with the naked eye. We believe that the proposed device could be a promising candidate in various oxygen sensing fields such as nearly anoxic systems, unsteady pressure measurement and unsteady flow visualization, etc.
研究领域:
材料科学
·
传感技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Shucheng Sun,Yujia Wang,Xin Liu,Rao Fu,Li Yang
A tapered-capillary microextraction ( t Cap-μEx) combining with field-amplified stacking (FASI) method for CE analysis was developed. The t Cap- μ Ex method is based on the construction of a micro solid phase extraction (SPE) column by narrowing the end of a silica capillary from 530 µm (inner diameter) to 20 µm, enabling the packing of 45 µm sorbent particles without a frit. Various parameters that may affect the microextraction and FASI-CE analysis have been investigated and optimized. This study shows that microextraction exhibits advantages of small sample and sorbent volumes (less than 200 μL sample and 2 μL sorbent) and fast extraction time of 6 min. The method was successfully applied for efficient determination of atenolol and metoprolol in human urine samples, with recovery of 93.7–105.5% and RSD (n=3) lower than 8.5%. Twenty-one-fold and nineteen-fold average enhancement of detection sensitivity was achieved for atenolol and metoprolol, respectively, versus the CE method without t Cap- μ Ex and FASI. The method is environmentally friendly and allows reuse of the sorbent at least 8 times without an obvious loss in performance. The results indicate that the proposed method could be potentially applied in a wide range of doping control, clinical, forensic toxicology, food analysis and environmental analyses.
研究领域:
分析化学
·
药物分析
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THIN SOLID FILMS
·
2024
·
IF 2
Tiebiao Qiu,Xin Jin,Lina Wang,Ting Lei,Guohao Bo,Jian Zhang
Sb 2 S 3 has garnered significant attention in photovoltaic applications due to its suitable bandgap, single stable orthogonal phase and excellent stability. However, due to the coexistence of indirect transition parts in the bandgap, a thicker Sb 2 S 3 absorption layer is usually required to achieve decent light absorption in solar cells, which inevitably leads to an increase in trapped states in the bulk. Therefore, it is of great importance to realize more photogenerated carriers without increasing charge recombination. Here, we realized the in-situ growth of high-quality Sb 2 S 3 micropillar arrays on the template prepared by laser direct writing. Compared with the traditional thick layer, this array structure with less material usage can not only achieve more light absorption by enhancing photon scattering, but also optimize carrier transport at the interface by expanding their contact area with the hole transporting layer. This work provides a strategy for controllably achieving enhanced light absorption of Sb 2 S 3 structures, which is a perspective for the improvement of highly efficient solar cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Bo Zhu,Di Tan,Kangjian Xiao,Zhekun Shi,Gang Li,Yifeng Lei,Daobing Chen,Sheng Liu,Longjian Xue
The gradient modulus in beetle setae plays a critical role in allowing it to stand and walk on natural surfaces. Mimicking beetle setae to create a modulus gradient in microscale, especially in the direction of setae radius, can achieve reliable contact and thus strong adhesion. However, it remains highly challenging to achieve modulus gradient along radial directions in setae-like structures. Here, polydimethylsiloxane (PDMS) micropillar with radial gradient modulus, (termed GM), is successfully constructed by making use of the polymerization inhibitor in the photosensitive resin template. GM gains adhesion up to 84 kPa, which is 2.3 and 4.7 times of soft homogeneous micropillars (SH) and hard homogeneous micropillars (HH), respectively. The radial gradient modulus facilitates contact formation on various surfaces and shifts stress concentration from contact perimeter to the center, resulting in adhesion enhancement. Meanwhile, GM achieves strong friction of 8.1 mN, which is 1.2 and 2.6 times of SH and HH, respectively. Moreover, GM possesses high robustness, maintaining strong adhesion and friction after 400 cycles of tests. The work here not only provides a robust structure for strong adhesion and friction, but also establishes a strategy to create modulus gradient at micron-scale.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 45
·26165-26171
·
IF 3.049
Shengyang Pan,Min Chen,Limin Wu
Although superomniphobic surfaces have attracted extensive interest owing to many important applications, successful fabrication of such surfaces still remains a critical challenge. Herein, we present a flexible transparent superomniphobic polydimethylsiloxane (PDMS) surface with a micropillar array using Si nanowires as the mould. The as-obtained PDMS not only exhibits excellent liquid-repellent performance with a static contact angle of over 150° and sliding angle of less than 6° against a wide range of liquids, but also maintains the super-repellency even under acid/base corrosion, mechanical damage, and unidirectional stretching.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Central South University
·
2022
·Vol. 29
·期 6
·1778-1787
·
IF 2.392
Zhang Hao,He Qing-song,Tian Cheng-bo,Wu Yu-wei,Zhao Ze-fang,Yu Min
Inspired by the microstructure of gecko’s toe, two kinds of polyvinyl chloride (PVC) gels with different modulus were poured on a silicon mold with micropillars, and then a bio-inspired adhesive with variable modulus was manufactured in this study. The adhesions of variable modulus and fixed modulus bio-inspired adhesives were tested, respectively, on a smooth glass and a printed circuit board (PCB) with different surface structures. The results show that PVC gel bio-inspired adhesives with variable modulus have many advantages compared with the fixed modulus bio-inspired adhesives. The adhesion of variable modulus bio-inspired adhesives on the rough PCB surface increased by 2–5 times, and due to the use of variable modulus of PVC gel, the surface micropillars can maintain high aspect ratio and flexible tips at the same time. Moreover, the use of PVC gel makes it easier to demold during the bio-inspired adhesives preparation. An adhesion-desorption device was made according to the movement of the gecko toes, and the PCB was successfully grasped.
研究领域:
材料科学
·
仿生学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
LAB ON A CHIP
·
2021
·Vol. 21
·期 20
·3933-3941
·
IF 6.799
Yu He,Zefan Lu,Hongliang Fan,Tao Zhang
Droplet microfluidics is a promising platform for various biological and biomedical applications. Among which, droplet-based digital PCR (ddPCR) is one of the most challenging examples, with practical issues involving possible fusion/fission of droplets during PCR thermocycling and difficulties of indexing them for real-time monitoring. While spatially trapped droplet arrays may be helpful, they currently are either of low trapping density or suffer from high droplet loss. In this paper, we, for the first time, report a photofabricated honeycomb micropillar array (PHMA) for high-density and loss-free droplet trapping. By rationally designing high-aspect-ratio micropillars into a honeycomb configuration, droplets can be captured at a density of 160–250 droplets per mm2 and, more interestingly, without any loss. The PHMA device can be fabricated from several photocurable materials, with one gasproof photopolymer being optimally selected herein to enable the simple design to avoid sample evaporation and tedious surface modification, thereby making the fabrication very convenient. Moreover, by using a photocurable oil as a continuous phase, the trapped droplets can be further immobilized, and thus, become more stable even in PCR thermocycling. With these features, the proposed PHMA has shown promising potential in ddPCR, and is expected to find a wide range of applications in various biological and biomedical research.
研究领域:
生物技术
·
医学检测
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bo Zhu,Hao Cao,Zhouxiang Chen,Wentao Wang,Zhekun Shi,Kangjian Xiao,Yifeng Lei,Sheng Liu,Yi Song,Longjian Xue
Robust and strong adhesion is highly required for reversible adhesions. Inspired by gecko setae and octopus sucker, micropillar array with frustum of conical micropits (FCM) was fabricated by direct laser writing lithography. With an optimized micropit in FCM, the adhesion strength of 1.2 MPa is achieved under a loading force of 5 mN, which is 3.7 and 2.1 times the micropillars with flat punch top and circular conical micropit, respectively. Under a loading force larger than 3 mN, compliant contacts are formed between FCM micropillars and the counterpart surface, which results in a uniformly distributed stress at the separating interface, an instantaneous detachment of multiple FCM micropillars, and therefore a strong adhesion. Moreover, the adhesion of FCM is quite robust that 1000 cycles of attaching and detaching have no influence on the adhesion performance. The work here not only provides a bioinspired structure for strong and robust adhesion but also consolidates the concept of combining features from different biological systems to create new functional materials.
研究领域:
材料科学
·
仿生学
·
生物力学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Jialing Zhou,Hui Huang,Qian Wang,Zhirui Li,Shunji Chen,Jun Yu,Yuan Zhong,Jing Chen,Huolin Huang
Owing to the separation of field-effect transistor (FET) devices from sensing environments, extended-gate FET (EGFET) biosensor features high stability and low cost. Herein, a highly sensitive EGFET biosensor based on a GaN micropillar array and polycrystalline layer (GMP) was fabricated, which was prepared by using simple one-step low-temperature MOCVD growth. In order to improve the sensitivity and detection limit of EGFET biosensor, the surface area and the electrical conductivity of extended-gate electrode can be increased by the micropillar array and the polycrystalline layer, respectively. The designed GMP-EGFET biosensor was modified with l-cysteine and applied for Hg2+ detection with a low limit of detection (LOD) of 1 ng/L, a high sensitivity of −16.3 mV/lg(μg/L) and a wide linear range (1 ng/L-24.5 μg/L). In addition, the detection of Hg2+ in human urine was realized with an LOD of 10 ng/L, which was more than 30 times lower than that of reported sensors. To our knowledge, it is the first time that GMP was used as extended-gate of EGFET biosensor.
研究领域:
生物传感技术
·
材料科学
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Youxu Yu,Jinwang Li,Yuxin Liu,Zhefei Pan,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Liang An,Rong Chen,Qiang Liao
Mesoporous TiO 2 photoanode shows promising application in photoelectrochemical systems due to large specific surface area and regular mesoporous structure. The evaporation-induced self-assembly method is usually employed for the preparation of mesoporous TiO 2 photoanodes. However, the photoelectrochemical performance of such a mesoporous TiO 2 photoanode prepared by this method is still unable to meet the demand owing to low photocatalyst loading, because the in-plane tensile stress during calcination may destroy the mesoporous TiO 2 film. To address this issue, the micropillar arrays supported mesoporous TiO 2 photoanode is proposed by directly synthesizing mesoporous TiO 2 film on the micropillar arrays loaded substrate. It is shown that the micropillar arrays interspersed inside the mesoporous TiO 2 film can help release the in-plane tensile stress during calcination, keeping the mesoporous structure intact. As a result, the photoelectrochemical cell with the optimized micropillar arrays supported mesoporous TiO 2 photoanode exhibits superior performance than does the nanoparticles-packed TiO 2 photoanode. Remarkably, the proposed method allows for preparing the TiO 2 micropillar arrays, by which the formed TiO 2 micropillar arrays supported mesoporous TiO 2 photoanode yields the optimal performance. As compared to the nanoparticles-packed TiO 2 photoanode, the short circuit current density and maximum power density increase by 63.6 % and 18.8 %, respectively.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 13
·5429-5435
·
IF 3.269
Yongyun Mao,Qian Zhao,Tingting Pan,Jiayan Shi,Shimei Jiang,Meiwan Chen,Bingpu Zhou,Yanqing Tian
Integrating an oxygen-sensitive probe (OSP) onto a three-dimensional (3D) microstructure substrate is a plausible technique to significantly improve the sensitivity of oxygen sensors. Despite the fact that polydimethylsiloxane (PDMS) matrices are regarded as the ideal sensory support, there are still no reports on an OSP functionalized flexible PDMS-based micropillar array (PDMS-MPAs) film as an optical oxygen sensor with capabilities to efficiently improve the sensor's overall performance, e.g. sensitivity, detection limit and stability against photo-bleaching. Herein, we reported the covalent bonding of a functional copolymer of platinum porphyrin (PtTPP)/3-(trimethoxysily)propylmethacrylate (PtTPP/TPMA) as the OSP on the surface of hydroxyl-modified PDMS-MPAs through a “grafting reaction” between PtTPP/TPMA and PDMS-MPAs. The homogeneous dispersion and well-isolated arrangement of the PtTPP/TPMA OSP on the 3D PDMS-MPA surface can ensure that the grafted OSP efficiently quenches the oxygen molecules. Consequently, the 3D PtTPP/TPMA-PDMS-MPA sensor film gives rise to a high fluorescence quenching efficiency of about 95% at 1 atm O2 (I0/I100 = 23) and 96% in aqueous solution (I0/IO2satu = 16) with an excellent linear Stern–Volmer plot (ksv = 0.1 h Pa−1, R2 = 0.997 in gas atmosphere and ksv = 12.8 mmol−1 L, R2 = 0.999 in aqueous solution, respectively), excellent reversibility and an ultra-low detection limit (4.7 μmol L−1) when compared with state-of-the-art PDMS-based oxygen sensors. Apart from the competitive sensitivity, the highly durable, reusable superiorities of the 3D PtTPP/TPMA-PDMS-MPA film can further facilitate the exploration and realization of the presented strategy for future oxygen sensor applications, such as the characterization of nearly anoxic systems in harsh environments.
研究领域:
材料科学
·
生物医学工程
·
化学传感
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 22
·2300773
·
IF 6.8
Yuxuan Sun,Huajian Zhang,Yong Zhao,Jiyang Wu,Yinbo Zhu,Mujun Li,Liu Wang
Magnetic micropillars have shown great promise in various applications including information storage, fluid manipulation, and soft robotics. But to date, magnetic micropillars with reprogrammable magnetization, multi-modal deformation and functionality, and on-demand fast actuation have not been reported yet. Herein, locally reprogrammable ferromagnetic micropillars with on-demand reconfiguration and multi-functionality are reported. The magnetic micropillars are fabricated by dispersing CrO 2 microparticles (diameter ≈5 µm, Curie temperature T c = 110 °C) in the Ecoflex matrix. The magnetization of each micropillar can be easily programmed and reprogrammed by simultaneously heating the micropillar above T c via laser and applying a magnetizing field. The magnetization can be programmed as omnidirectional in three dimensions, thus entire magnetic micropillar arrays show a variety of deformation modes (including both synchronous and asynchronous modes) with on-demand fast actuation by remotely applying magnetic fields. Four representative functionalities of the magnetic micropillars are demonstrated: information encryption, particle pumping, ink mixing, and underwater crawling robot.
研究领域:
材料科学
·
软体机器人
·
微流控技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）