Ultrafast Response Time Research Articles

Spontaneously Induced Hierarchical Structure by Surface Energy in Novel Conjugated Polymer‐Based Ultrafast‐Response Organic Photodetectors

AbstractA novel conjugated polymer, poly(4‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b']dithiophen‐2‐yl)‐2,6‐dioctylbenzo[1,2‐d:4,5‐d']bis(oxazole)) (PBB), is synthesized for use in ultrafast‐response organic photodetectors (OPDs). The PBB synthesis is considered facile because a monomer could be isolated without column chromatography purification. The excellent solubility of PBB allows easy dissolution in both halogenated and nonhalogenated solvents, facilitating the fabrication of p‐n heterojunction OPDs based‐on PBB and 6,6‐phenyl‐C71‐butyric acid methyl ester (PC71BM) using either chloroform (CF) or o‐xylene (Xy). Notably, Xy‐processed OPDs show superior performance with a responsivity (R) of 0.385 A W−1 and specific detectivity (D*) of 1.33 × 1013 Jones at –1 V, whereas CF‐based devices showed an R of 0.349 A W−1 and D* of 5.86 × 1012 Jones. More importantly, Xy‐processed OPDs exhibited an ultrafast signal response time of 3 µs, which is much faster than that of CF‐processed OPDs (42 µs). These superior static and dynamic properties of PBB:PC71BM devices are achieved by the inverted hierarchical arrangement of PBB and PC71BM via a biased orientation of PC71BM toward the ZnO layer as well as a homogenous nanomorphology. This ideal morphology is spontaneously induced due to the difference in interfacial energy between PBB and PC71BM toward the ZnO surface and a well‐mixed PBB:PC71BM blend in Xy solvent.

RF Sputtered Nb-Doped MoS2 Thin Film for Effective Detection of NO2 Gas Molecules: Theoretical and Experimental Studies.

Doping plays a significant role in affecting the physical and chemical properties of two-dimensional (2D) dichalcogenide materials. Controllable doping is one of the major factors in the modification of the electronic and mechanical properties of 2D materials. MoS2 2D materials have gained significant attention in gas sensing owing to their high surface-to-volume ratio. However, low response and recovery time hinder their application in practical gas sensors. Herein, we report the enhanced gas response and recovery of Nb-doped MoS2 gas sensor synthesized through physical vapor deposition (PVD) toward NO2 at different temperatures. The electronic states of MoS2 and Nb-doped MOS2 monolayers grown by PVD were analyzed based on their work functions. Doping with Nb increases the work function of MoS2 and its electronic properties. The Nb-doped MoS2 showed an ultrafast response and recovery time of trec = 30/85 s toward 5 ppm of NO2 at their optimal operating temperature (100 °C). The experimental results complement the electron difference density functional theory calculation, showing both physisorption and chemisorption of NO2 gas molecules on niobium substitution doping in MoS2.

Water rewriteable double-inverse opal photonic crystal films with ultrafast response time and robust writing capability

Photonic paper, as a crucial branch of the research of structural color materials, has attracted considerable attention. Herein, innovative large-area water rewriteable double-inverse opal (WRDIO) film with ultrafast response time (∼0.8 s) and robust writing capability is fabricated by introducing polyacrylamide gel into the double-inverse opal. The hydrophilic nature of the polyacrylamide gel can induce water to quickly penetrate the internal pores of the inverted opal backbone. Simultaneously, the randomly distributed polystyrene microspheres within the pores become ordered under the action of liquid buoyancy, which eliminates the scattering disturbance and makes the film switch to the structural color state. Importantly, the as-prepared WRDIO film can be erased and rewritten over 500 cycles without significantly reducing the color quality. Besides, the retention time of the written marks can be controlled by writing using water pens with different water outputs. Interestingly, responsive spatio-temporal colorful patterns could be achieved based on the different volatilities of written marks. Furthermore, advanced optical anti-counterfeiting material with multistate switching for information security is prepared based on controlled wettability. Given these superior properties, this novel WRDIO film provides a new solution for future applications of rewriteable paper.

Van der Waals Epitaxial Deposition of CsPbBr3 Films for Flexible Optoelectronic Applications

Growth of high-quality inorganic halide perovskite films has attracted increasing attention in recent years for their important applications in solar cells, photodetectors, and communications. In this study, a centimeter-sized inorganic perovskite film of CsPbBr3 was prepared on an atomically flat flexible muscovite substrate by using pulsed laser deposition. Van der Waals epitaxial growth of pure cubic phase CsPbBr3 film is achieved by optimizing deposition conditions. In order to explore its potential in optoelectronic applications, the CsPbBr3 perovskite film was assembled into a planar photodetector. Benefitting from the high crystallinity of the film, the photodetector demonstrates an ultralow dark current and a high sensitivity to light. Under 10 V bias voltage and 405 nm irradiation, the device presents a high photocurrent on/off ratio of 1.1 × 105, a specific detectivity of 2.41 × 1014 Jones, and an ultrafast response time (the rising and decaying times are 42.16 μs and 44.88 μs, respectively). Moreover, the CsPbBr3-based photodetectors without encapsulation show good long-term stability (30 days with 6% attenuation) and bending stability. All these results indicate that a CsPbBr3 film epitaxially grown on flexible muscovite is a promising candidate for flexible optoelectronic applications.

Laser‐Engraved Boron‐Doped Diamond for Copper Catalyzed Non‐Enzymatic Glucose Sensing

AbstractRobust and high‐performance electrochemical electrodes for non‐enzymatic glucose sensing are in constant demand. Herein, a hierarchical nonenzymatic glucose sensing electrode on boron‐doped diamond (BDD) is fabricated using high‐speed laser engraving and pulsed electrodeposition of Cu nanostructures. The obtained electrode contains a densely packed Cu nanoflake (CuNF) array periodically decorated on the laser‐engraved BDD. The hierarchical nanoarchitecture combines the d‐band catalytic activity of the CuNFs with the low capacitive background current of the engraved BDD substrate, thus enabling fast, precise, and high signal‐to‐noise ratio detection of trace glucose. Outstanding performances that combine high sensitivity of 2119 µA cm–2 mm–1, ultrafast response time of <1 s, and low detection limit of 0.2 × 10−6 m are experimentally demonstrated. Furthermore, the electrode exhibits excellent cyclicality and anti‐interference ability, and maintains 90% of its initial responsivity after being stored in air for >8 months, indicating great stability for practical usage.

High-performance ultraviolet photodetectors based on 2D layered In4/3P2Se6 nanoflakes

Ultraviolet photodetectors (UV PDs) based on 2D layered materials have attracted much attention because of the great applications in the fields of biology, healthcare, and space science, as well as the unique optical and electrical properties of 2D layered materials. Many UV PDs have been reported. However, high performance UV PDs with high responsivity and ultrafast light response time still need to be explored further. Here, we synthesized layered In4/3P2Se6 nanoflakes via the chemical vapor conversion (CVC) method. The UV PDs based on as-grown In4/3P2Se6 nanoflakes exhibit a very high light switching ratio of up to 6 × 105 at room temperature, which is ascribed to the large photocurrent and an ultralow dark current of ∼80 fA. Meanwhile, an ultrafast rise and a decay time of ∼ 470 μs/440 μs are achieved. The according responsivity, external quantum efficiency, and special detectivity are 4.31 A W−1, 1485.2%, and 6.3 × 1012 Jones, respectively, which are excellent performance among the UV PDs based 2D layered materials. Notably, it has both high responsivity and fast light response time, better than other 2D layered semiconductor photodetectors. Our finding demonstrates In4/3P2Se6 nanoflakes are promising materials for high performance UV PDs in the future.

Synergistic Effect of Au Interband Transition on Graphene Oxide/ZnO Heterostructure: Experimental Analysis with FDTD Simulation.

We furnish a comprehensive study on light-induced carrier generation due to the synergistic contribution of Au interband transition and graphene oxide (GO)/ZnO heterostructure. Plasmonic gold nanoparticles (Au_nps) are incorporated as a substructure sandwiched between GO and ZnO, assisting in additional photo-induced charge carrier generation. GO is prepared by a single-step plasma-enhanced chemical vapor deposition process. The GO/ZnO heterostructure having an active working area of 0.25 cm2 is created to unleash the pyroelectric property of ZnO, and subsequently, Au_np is introduced at the interface of GO/ZnO. Here, the interband transition of Au_np and its capability for charge carrier generation combined with the excitonic charge carrier generation of the highly crystalline non-centrosymmetric hexagonal wurtzite ZnO enhances the photoresponse. Furthermore, the interaction of Au_np with ZnO and its spatial electric field intensity distribution is demonstrated by finite difference time domain simulation which indicate toward an efficient carrier generation at the interface of Au_np and ZnO. The fabricated heterostructure has an active working wavelength in the UV-A region with the highest responsivity at 375 nm of the electromagnetic spectrum. The ultrafast response time (∼29 μs) of the device is due to the pyro-phototronic effect of the GO/ZnO heterostructure enhanced by the interband transition of Au. In the comparative study of the Au_np-enriched GO/ZnO heterostructure device with a GO/ZnO device, the former shows better performance. Both the devices work in the self-powered mode as well as the photoconductive mode, but with a higher on–off current ratio in the photoconductive mode. Hence, this work helps in properly understanding photo-induced charge generation in a Au interband transition enriched GO/ZnO heterostructure.

Carbon monoxide detection down to ppb-level realized by O2 plasma treated TiO2-gated AlGaN/GaN HEMT sensor

The AlGaN/GaN high electron mobility transistor (HEMT) based sensors with O2 plasma treated TiO2 film as the gate electrode were fabricated. The ultrafast ppb-level carbon monoxide detection was achieved under dry air atmosphere. It is revealed that the O2 plasma treatment on TiO2 film significantly increases the effective work function of TiO2 film due to the strong dipole layer formation which is induced by the adsorption of O2 bonding states. As a result, the HEMT drain current observably decreases. Thus, when CO gas is introduced, the reduction reaction between O2 bonding states and CO molecules weakens the strength of the formed dipole layer, resulting in the decrease of the effective work function of TiO2 electrode and the significant increase of HEMT conduction current. It is demonstrated that with O2 plasma treatment the gas sensor based on TiO2 gated AlGaN/GaN HEMT can detect CO concentration down to 10 ppb with a response time of ~100 s and 0.15 mA conduction current variation. Furthermore, the ultrafast response time of ~4 s for ≥ 500 ppb CO, high resolution of CO concentration, and long-term stability are also demonstrated.

A Novel Micro-Pressure Graphene Sensor Array With Double-Layer Mesh Structure

In this work, a novel micro-pressure graphene sensor array with double-layer mesh structure is designed in order to effectively realize the multi-point measurement of micro-pressure. A <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$4\times 4$ </tex-math></inline-formula> sensor array could form 16 pressure-sensing pixels with good multi-point measurement capability. The double-layer mesh graphene with interconnected porous microstructure is fabricated with a cheap and convenient laser direct writing (LDW) technique. Based on the excellent microstructure and the double-layer mesh structure, this graphene pressure sensor array demonstrates high sensitivity in the low-pressure range (0.339 kPa <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup> , < 200 Pa), ultra-fast response time (< 30 ms), and prominent repeatability (>200 cycles), which meets the requirements of micro-pressure measurement. In addition, a full-automatic micro-pressure demodulation system equipped with human-computer interaction interface is designed to realize the two-dimensional shape recognition. Therefore, it could open broad applications in the fields of micro-pressure measurement, two-dimensional shape recognition and wearable electronic devices.

High-Performance Broadband Photoelectrochemical Photodetectors Based on Ultrathin Bi2O2S Nanosheets.

Two-dimensional (2D) bismuth oxychalcogenide (Bi2O2X, X refers to S, Se, and Te) is one type of rising semiconductor with excellent electrical transport properties, high photoresponse, and good air stability. However, the research on 2D Bi2O2S is limited. In this work, ultrathin Bi2O2S nanosheets are synthesized by a facile and eco-friendly chemical synthesis method at room temperature. The thickness and lateral sizes are 2-4 nm and 20-40 nm, respectively. The 2D ultrathin Bi2O2S nanosheets have a broad absorption spectrum from ultraviolet (UV) to near-infrared (NIR). Photoelectrochemical (PEC) photodetectors based on 2D Bi2O2S nanosheets are fabricated by a simple drop-casting method. The 2D Bi2O2S-based PEC photodetectors show excellent photodetection performance with a broad photoresponse spectrum from 365 to 850 nm, a high responsivity of 13.0 mA/W, ultrafast response times of 10/45 ms, and good long-term stability at a bias voltage of 0.6 V, which are superior to most 2D material-based PEC photodetectors. Further, the 2D Bi2O2S PEC photodetector can function as a high-performance self-powered broadband photodetector. Moreover, the photoresponse performance can be effectively tuned by the concentration and the kind of electrolyte. Our results demonstrate that 2D Bi2O2S nanosheets hold great promise for application in high-performance optoelectronic devices.

High-Transmittance Femtosecond Optical Kerr Gate with Double Gate Pulses Based on Birefringence Effect

An optical Kerr gate (OKG) is an ultrafast optical switch based on the optical Kerr effect. The performance of a conventional OKG depends mainly on Kerr materials. Traditional Kerr materials do not demonstrate both large optical nonlinearity and an ultrafast response time. Therefore, the performance of a conventional OKG is limited by an inherent trade-off between high signal transmittance and fast switching time, which limits its application in many fields. We propose an improved femtosecond OKG with double gate pulses, based on the use of a birefringent crystal to realize an ultrashort switching time, even with a slow-response optical Kerr medium. We assessed the dependence of the double gate pulsed OKG (D-OKG)’s performance on the intensity ratio of the double gate pulses. A transmittance of 50% and a switching time of 142 fs were achieved. The D-OKG is convenient to construct, and its integrated performance is superior to that of a conventional OKG.

Rational design of a facile camphor-based fluorescence turn-on probe for real-time tracking of hypochlorous acid in vivo and in vitro.

A simple yet highly effective camphor-derived fluorescent probe named 3-(anthracen-9-ylmethylene)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-one oxime (ATHO) was developed based on an oxime recognition receptor and anthracene fluorophore. The probe ATHO exhibited a remarkably enhanced fluorescence response to HClO (∼7.2 fold). Meanwhile, this probe exhibited a low detection limit (0.118 μM), ultrafast response time (within seconds), excellent photostability (>260 min), wide linear range (0-180 μM), low probe concentration (2 μM), and high selectivity toward HClO over various interfering species. The sensing mechanism of the probe ATHO for HClO was supported by HRMS analysis and theoretical calculations. Furthermore, the probe ATHO was utilized to quantitatively determine HClO levels in environmental water samples. Additionally, the biological imaging of the probe ATHO for exogenous and endogenous HClO was successfully demonstrated in vitro and in vivo.

Three-band plasmon induced transparency effect based on four-disk resonator coupled waveguide system

In order to reduce power consumption and realize ultrafast response time and dynamic tunability, a plasmonic waveguide system based on four disk resonators is designed. A plasmon induced transparency effect is theoretically analyzed by using two different methods: one is the direct destructive interference between bright mode resonator and dark mode resonator, and the other is the indirect coupling through a plasmonic waveguide. Owing to the giant effective nonlinear Kerr coefficient of the graphene-Ag composite material structure and the enhancement characteristics of slow light response to optical Kerr effect, the pump intensity of PIT system for changing the phase shift of transmission spectrum is greatly reduced. An ultrafast response time of 1 ps is achieved, and 0.4π, 0.8π, 1.2π, 1.6π and 2π-phase shift of the transmission spectrum in the plasmon induced transparency system are achieved with the intensity of the pump light as low as 2.34, 4.68, 7.02, 9.36, 11.7 MW/cm&lt;sup&gt;–2&lt;/sup&gt;, respectively. In this work, a plasmonic waveguide coupled directly by two small disk resonators is employed, because two small disk resonators play a role of the slit between the waveguide and the resonators, and also act as two separate resonators side-coupled with a plasmonic waveguide, which leads to the more efficient coupling of electromagnetic energy in the waveguide into the big disk resonators to form resonance and easier storage of light in the resonator. The triple-band plasmon induced transparency (PIT) effect and slow light properties of the model are analyzed by the expression of the deduced theoretical transmittance based on the coupled mode theory, indicating that they are very consistent with the finite-difference time-domain simulations. The results show that the transmission peak of the system is over 80% and the maximum group index is as high as 368. Furthermore, the disk resonators are easy to fabricate and the size of the entire PIT structure is &lt; 0.5 μm&lt;sup&gt;2&lt;/sup&gt;, which is beneficial to the design of optoelectronic device on-chip integration. The research results have important application prospects in highly integrating optical circuits and networks, and also provide the ideas for the design and fabrication of multi-channel optical filter and light storage devices with low power consumption, ultrafast nonlinear response, ultracompact and dynamical tunability.

A UiO-66 3D photonic crystal optical sensor for highly efficient chlorobenzene vapor detection.

Chlorobenzene (C6H5Cl) is a flammable liquid with high vapor activity, which is a severe threat to the environment and human health. Therefore, it is essential to develop a highly efficient sensor to detect C6H5Cl vapor. Herein, we developed a UiO-66 three-dimensional photonic crystal (3D PC) optical sensor and investigated its sensing properties toward the C6H5Cl vapor. The UiO-66 3D PCs optical sensor shows a high sensitivity of C6H5Cl vapor, in the concentrations range of 0-500 ppm, the reflectance intensity response to be 0.06% ppm with a good linear relationship, detection limit can reach 1.64 ppm and the quality factor is 10.8. Additionally, the UiO-66 3D PC optical sensor demonstrated great selectivity with the values of selectivity (S) varying from 2.24 to 10.65 for the C6H5Cl vapor as compared with carbon tetrachloride (CCl4), dichloromethane (CH2Cl2), 1,1,2-trichloroethane (C2H3Cl3), benzene (C6H6), deionized water (H2O), ethanol (C2H5OH) and methyl alcohol (CH3OH) vapors. Moreover, the UiO-66 3D PC optical sensor shows an ultrafast optical response time and recovery times of 0.5 s and 0.45 s with exceptional stability and repeatability to 500 ppm C6H5Cl vapor. These excellent sensing properties are attributed to the efficacy of signal transduction, increased porosity and gas adsorption sites, which are intrinsically endowed by the design of the 3D optical structure. The design and fabrication of this UiO-66 3D PC optical sensor might open up potential applications for the detection of the C6H5Cl vapor.

Surface engineering of a triboelectric nanogenerator for room temperature high-performance self-powered formaldehyde sensors

Surface engineering of triboelectric nanogenerator for room temperature self-powered formaldehyde (FA) sensor is demonstrated. Such device delivers not only high power density but also remarkable selectivity and ultra-fast response time to FA gas.

Plasmon induced transparency effect based on graphene nanoribbon waveguide side-coupled with rectangle cavities system

In order to reduce the size of the device and realize the ultrafast response time and dynamic tunableness, the single-band and dual-band plasmon induced transparency (PIT) effect are investigated based on graphene nanoribbon waveguide side-coupled rectangle cavity. The slow light properties of the model are analyzed numerically and theoretically by coupled mode theory and finite difference time domain method. With controlling the chemical potential of the graphene rectangle cavity, the tunability of the resonant wavelength and the transmission peak can be achieved simultaneously in single-band and dual-band PIT model. As the chemical potential of graphene increases, the resonant wavelength of each transmission window of PIT effect decreases gradually and presents the blue shift. In addition, through dynamically tuning the resonant wavelength of the graphene rectangle cavity, when the chemical potential of the graphene rectangle cavity increases from 0.41 to 0.44 eV, the group index of single PIT system is controlled to be between 79.2 and 28.3, and the tunable bandwidth is 477 nm. Moreover, the group index of dual PIT system is controlled to be between 143.2 and 108.6 when the chemical potentials of graphene rectangle cavities 1, 2, and 3 are 0.39–0.42 eV, 0.40–0.43 eV, and 0.41–0.44 eV, respectively. The size of the entire PIT structure is &lt;0.5 μm&lt;sup&gt;2&lt;/sup&gt;. The research results here in this work are of reference significance in designing and fabricating the optical sensors, optical filters, slow light and light storage devices with ultrafast, ultracompact and dynamic tunableness.

Underwater Self‐Powered All‐Optical Wireless Ultrasonic Sensing, Positioning and Communication with Ultrafast Response Time and Ultrahigh Sensitivity

AbstractThe utilization of ultrasonic waves in the ocean has become an attractive topic for its applications in underwater sensor networks via a variety of research methods, such as sensing, positioning, and communication. However, it is still challenging to develop a cost‐effective, stable, fast, and accurate wireless underwater ultrasonic device with self‐power‐ability in various circumstances. Herein, a novel underwater self‐powered all‐optical wireless ultrasonic sensor (SAWS) based on triboelectrification‐induced electroluminescence (TIEL) has been proposed, in which efficient and stable TIEL can be generated under the excitation of ultrasonic waves. The SAWS has been demonstrated to accurately determine the location of the ultrasonic source with an error of less than 4.6%, and as a promising candidate for real‐time optical signal communication with an ultrafast response time of below 50 ms and an ultrahigh signal‐to‐noise ratio (SNR) of 26.02 dB. To date, the paradigm‐shift strategy for underwater ultrasonic sensing has been developed for the first time to be fully self‐powered without any wire connections. The SAWS proposed here paves a new path to the realization of a self‐powered underwater all‐optical wireless sensing system that can be effectively applied in underwater environmental monitoring, underwater robots, ocean sensor networks, etc.

An Integrated Self-Powered Real-Time Pedometer System with Ultrafast Response and High Accuracy.

As accurate step counting is a critical indicator for exercise evaluation in daily life, pedometers give a quantitative prediction of steps and analyze the amount of exercise to regulate the exercise plan. However, the merchandized pedometers still suffer from limited battery life and low accuracy. In this work, an integrated self-powered real-time pedometer system has been demonstrated. The highly integrated system contains a porous triboelectric nanogenerator (P-TENG), a data acquisition and processing (DAQP) module, and a mobile phone APP. The P-TENG works as a pressure sensor that generates electrical signals synchronized with users' footsteps, and combining it with the analogue front-end (AFE) circuit yields an ultrafast response time of 8 ms. Moreover, the combination of a mini press-to-spin-type electromagnetic generator (EMG) and a supercapacitor enables a self-powered and self-sustained operation of the entire pedometer system. This work implements the regulation of TENG signals by electronic circuit design and proposes a highly integrated system. The improved reliability and practicality provide more possibilities for wearable self-powered electronic devices.

High-Performing Self-Powered Photosensing and Reconfigurable Pyro-photoelectric Memory with Ferroelectric Hafnium Oxide.

With highly diverse multifunctional properties, hafnium oxide (HfO2 ) has attracted considerable attention not only because of its potential to address fundamental questions about material behaviors, but also its potential for applied perspectives like ferroelectric memory, transistors, and pyroelectric sensors.However, effective harvesting of the pyro-photoelectric effect of HfO2 to develop high-performing self-biased photosensors and electric writable and optical readable memory has yet to be developed. Here, a proof-of-concept HfO2 -based self-powered and ultrafast (response time ≈ 60 µs) infrared pyroelectric sensor with a responsivity of up to 68 µA W-1 is developed. In particular, temporal infrared light illumination induced surface heating and, in turn, change in spontaneous polarization are attributed to robust pyro-photocurrent generation. Further, controllable suspension and reestablishment of the self-biased pyro-photocurrent response with a short electric pulse are demonstrated, which offers a conceptually new kind of photoreadable memory. Potentially, the novel approach opens a new avenue for designing on-demand pyro-phototronic response over a desired area and offers the opportunity to utilize it for various applications, including memory storage, neuromorphic vision sensors, classification, and emergency alert systems.

A conveniently synthesized redox-active fluorescent covalent organic framework for selective detection and adsorption of uranium

Uranium is a key element in the nuclear industry and also a global environmental contaminant with combined highly toxic and radioactive. Currently, the materials based on post-modification of amidoxime have been developed for uranium detection and adsorption. However, the affinity of amidoxime group for vanadium is stronger than that of uranium, which is the main challenge hindering the practical application of amidoxime-based adsorbents. Herein, we synthesized a fluorescent covalent organic framework (TFPPy-BDOH) through integrating biphenyl diamine and pyrene unit into the π-conjugated framework. TFPPy-BDOH has an excellent selectivity to uranium due to the synergistic effect of nitrogen atom in the imine bond and hydroxyl groups in conjugated framework. It can achieve ultra-fast fluorescence response time (2 s) and ultra-low detection limit (8.8 nM), which may be attributed to its intrinsic regular porous channel structures and excellent hydrophilicity. More excitingly, TFPPy-BDOH can chemically reduce soluble U (VI) to insoluble U (IV), and release the binding site to adsorb additional U (VI), achieving high adsorption capacity of 982.6 ± 49.1 mg g−1. Therefore, TFPPy-BDOH can overcome the challenges faced by current amidoxime-based adsorbents, making it as a potential adsorbent in practical applications.