Efficient full-color fluorescent carbon quantum dots are synthesized by acid reagent engineering for white light–emitting devices.

Abstract Sustainable, inexpensive, and environmentally friendly biomass waste can be exploited for large‐scale production of carbon nanomaterials. Here, alkali lignin was employed as a precursor to synthesize quantum dots (CQDs) with bright green fluorescence through simple one‐pot route. The prepared CQDs had size 1.5–3.5 nm, were water‐dispersible, showed wonderful biocompatibility, in addition their excellent photoluminescence electrocatalysis properties. These high‐quality could used...

A dual-mode colorimetric/fluorescence pH sensor was fabricated from carbon dots (CDs). It exhibited a response via both fluorescence and visible colorimetric observation. The CDs solution changed red to yellow when the acid alkaline. Meanwhile, color of test paper that incorporated purple-red orange then yellow. CD maximum at 630 nm in 590 under neutral alkaline conditions. yellow, which better than pure solution. highly selective reversible quenching with respect Cu2+ ions because strong...

Here we introduce a simple, superfast, and scalable strategy that obtains graphene quantum dots (GQDs) within 3 min under microwave irradiation (MA-GQDs). The MA-GQDs exhibit excellent fluorescence yields up to 35% in the optimum reaction condition. with single-crystalline few-layer structure can reach visible region longest absorption wavelength at 700 nm. Moreover, these ultrabright-fluorescence stable as phosphor probe could be efficiently applied white light-emitting diodes cell-imaging...

Oxygen reduction reaction (ORR) plays a critical position in direct methanol fuel cells. However, electrocatalytic materials currently utilized ORR use rare and expensive metal Pt, so it is vital to develop cathode catalysts with cheap high activity. Herein, chitosan, natural material made from chitin, was employed as complex precursor of carbon source nitrogen (N) synthesize N-doped mesoporous biomass catalysts. Adding different pore agents regulated specific surface area N type The...

In this work, a conductive composite film composed of multi-walled carbon nanotubes (MWCNTs) and multi-layer Ti3C2Tx MXene nanosheets is used to construct strain sensor on sandpaper Ecoflex substrate. The material forms sophisticated network with exceptional electrical conductivity, resulting in sensors broad detection ranges high sensitivities. findings indicate that the sensing range Ecoflex/Ti3C2Tx/MWCNT sensor, when mass ratio set 5:2, extends 240%, gauge factor (GF) 933 within interval...

A new class of white luminescent materials, white-light-emitting graphene quantum dots (WGQDs), have attracted increasing attention because their unique features and potential applications.

Room-temperature phosphorescent (RTP) carbon dots (CDs) have been fascinated by a lot of scholars because their stable triplet excited states and environmental friendliness. Herein, novel fluorescent oxygen-enriched CDs were synthesized simple one-step solvothermal approach, which can be applied in cell imaging directly as nontoxic probe. When mixing the with polyvinyl alcohol, composite exhibits excellent RTP performance, has exciting prospect applications security protection. The observed...

Water deficiency is likely to become more frequent and intense as a result of global climate change, which may severely impact agricultural production in the world. The positive effects melatonin (MEL) on alleviation drought or osmotic stress-induced water plants has been well reported. However, underlying mechanism MEL detailed process plant uptake transport under condition remains largely unknown. Application 1 μM led enhanced tolerance stress maize seedlings, evidenced by maintaining...

With the development of environment and human society, removal metal ions dyes in wastewater treatment remains an urgent problem to solve. In this work, two biomass carbon adsorbents were synthesized by a KOH activation carbonization route using sorghum stem root as precursors. comparison with samples without activation, pore structure KOH-activated has been dramatically improved. The findings show that specific surface areas (S1) (R1) 948.6 168.1 m2 g-1, respectively. Meanwhile, abundant...

With advancements in artificial intelligence, wearable motion recognition systems based on flexible nanomaterial sensors exhibit excellent potential for harmonious human–machine interaction. However, the sensing stability and demand of large‐scale arrays limit application sensors. Herein, a data glove system simple multiwalled carbon nanotube (MWCNT) lightweight deep‐learning algorithm to achieve accurate gesture is proposed. A regional‐crack mechanism introduced through microspine structure...

The carbon-coated nanoarray structure can be stabilized in alkaline solution, which inhibits the dendrite growth and improves cell lifetime.

Efficient conversion of CO2 to value-added fuels or chemicals using electricity from renewable sources is an appealing approach realize carbon neutrality. Under this background, it crucial design efficient and low-cost catalysts for electroreduction. Herein, we fabricated electrocatalyst with the structure Cu–Ni alloy nanoparticles grown on nitrogen-doped nanotubes (CuxNi/NCNT, x = 2.4, 1, 0.36) electrochemical reduction reaction (CO2RR) via a hydrothermal method followed by pyrolysis. The...

Microservice architectures have become a popular approach for designing scalable distributed applications. Despite their extensive use in industrial settings over decade, there is limited understanding of the data management challenges that arise these Consequently, it has been difficult to advance system technologies effectively support microservice To fill this gap, we present Online Marketplace, benchmark highlights core existing benchmarks fail address. These include transaction...

The rapid development of the license plate recognition technology has made great progress for its widespread uses in intelligent transportation system (ITS). This paper proposed a novel detection and character algorithm based on combined feature extraction model BPNN (Backpropagation Neural Network) which is adaptable weak illumination complicated backgrounds. Firstly, preprocessing first used to strengthen contrast ratio original car image. Secondly, candidate regions are checked verify...

Long-term and stable monitoring of bioelectrical signals represented by electrocardiogram (ECG) has a great application value for wearable electronics. The ECG require low-cost, flexible robust electrical system that can work throughout daily activities. In this article, we propose paper-assisted strategy to fabricate tattoo electrode based on the low-cost water transfer printing technology. Similar attached skin, fabricated allows complying with skin deformation comfortably accommodating...

Capacitive pressure sensors based on porous structures have been widely researched and applied to a variety of practical applications. To date, it remains big challenge develop capacitive sensor with high sensitivity good linearity over wide range. In this paper, sensitive, flexible, was designed manufactured by means the "salt template method" man-made grooves. aim, size salt particles used for forming pores/air voids, time taken thorough dissolution particles, depth groove pin were into...

Abstract Exploring high‐efficiency, long‐term cycling stability, and cost‐effective cathode materials for lithium‐sulfur (Li−S) batteries is hugely desirable challenging. Herein, we have successfully developed a simple solution‐based spray‐drying method to fabricate nitrogen‐doped hollow porous carbon spheres (N‐HPCS) with biomass lignin as precursor cyanuric acid N‐dopant porogen. The obtained N‐HPCS shows specific surface area of 446.2 m 2 g −1 high‐level pyrrolic‐N doping 64.13 %....

Flexible electronics intensely pursues the development of new-generation electronic skin and human–machine interfaces. However, monitoring human motions with both large dynamic range high sensitivity effectively remains a challenge for wearable strain sensors. In this study, we proposed flexible sensor based on an elastic-sliding mechanism self-assembled PDMS/MoS2/MWCNT structure. The dense MWCNT networks could wrap bridge solid lubricant MoS2 particles to form conductive paths. Even under...

Abstract Intelligent soft robotics and wearable electronics require flexible, wireless radio frequency (RF) pressure sensors for human‐like tactile perception of their moving parts. Existing devices face two challenges array extension: the construction sensitive units over a limited area handling resonant peaks overlapping within channel width. Herein, simply adjustable RF‐resonator‐based (RFTA) is reported, in which initial each resonator unit regulated by doping polydimethylsiloxane (PDMS)...

This paper addresses the problem of almost disturbance decoupling (ADD) using sampled-data output feedback control for a class continuous-time nonlinear systems. Under lower-triangular linear growth condition, controller is constructed based on domination approach, and Gronwall–Bellman-like inequality established in presence disturbances. Even though employed easy computer implementation, proposed still able to achieve ADD under commonly used requirement, that is, disturbances' effect...

Soft and stretchable sensors are essential to the development of electronic skin, especially their potential applications in health care intelligent robots, which have increasingly attracted attentions. Herein, inspired by epidermal tissue hierarchy, we propose a high-sensitivity fully soft capacitive pressure sensor with bionic spine-pillar microstructure. Benefiting from combination random microscale spines millimeter-sized pillar array prepared based on polydimethylsiloxane, proposed...