In recent times e-textiles have emerged as wonder safeguards due to the great potential background in space, military, healthcare, or portable electronics. As a result, widespread research and development have been done to make significant advancement in this field, but it still remains a key challenge to use one single product with multifunctional attributes with the past performance of key characteristics. In this work, phase-separated PEDOT:PSS ornamented with reduced graphene oxide (rGO) nanosheets, deposited on the newly fabricated ultralightweight, superhydrophobic, and mechanically enriched merino wool/nylon (W−N) composite textile followed by the dipping and drying strategy. The open edges-layered structure of rGO helping uniform deposition of PEDOTs clusters, which allows the formation of a stacked layer of PEDOTs/rGO-PEDOTs/PEDOTs for robust three-dimensional electrical transforming channel network within the W−N textile surface. These dip-coated multifunctional textiles show high electrical conductivities up to 90.5 S cm −1 conjugated with a flexible electromagnetic interference shielding efficiency of 73.8 dB (in X-band) and in-plane thermal conductivity of 0.81 W/mK with a minimum thickness of 0.84 mm. This thin coating maintained the hydrophobicity (water contact angle of ∼150°) leading to an excellent EM protective cloth combined with real-life antenna performance under high mechanical or chemical tolerance. Interestingly, this multiuse textile can also act as an exceptional TASER Proof Textile (TPT) due to a short out of the electrical shock coming from the TASER by its unique conducting network architecture. Remarkably, this coated textile can get a response by the soft touch to lighten up the household bulb and could establish wireless communication via an HC-05 Bluetooth module as a textile-based touch switch. This developed fabric could perform as a new potentially scalable single product in intelligent smart garments, portable nextgeneration electronics, and the growing threat of EM pollution.

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Accurate diagnosis with secure and target-specific drug delivery improves the success rate in cancer treatment and patient survival outcomes. The development of stimuli-responsive theranostic with the molecular computing ability could address all these criteria at a time. This work attempts to design a multifunctional biocomputing agent that can serve as a secure and target-specific drug carrier and simultaneously act as a molecular logic device. Hence, we developed holmium-doped carbon dot-gelatin nanoparticles (HoCDGNPs) by two-step desolvation methods and used them as fluorescence (FL) imaging and MRI contrast agents with effective pH and Cu 2+ ion sensing ability. Furthermore, Boolean algebraic operations (NOR, OR, IMP, and NIMP) are executed on the HoCDGNP system using the FL/magnetic resonance (MR) response in the presence of different inputs (H + , OH − , and Cu 2+ ions), and the results are mesmerizing. Moreover, the FL quenching phenomena of HoCDGNPs in the presence of Cu 2+ ions by cupricamine or cupric-carboxylate coordination formation are also exploited in the living HeLa cells. Finally, the resulting system is used for pH-responsive drug delivery of a model anticancer drug (5-fluorouracil), and the release profile is found selective and sustained over the pH range 6−7.4. Thus, it counters the shortcomings associated with the 5-fluorouracil drug administration (short lifetime and poor specificity at high doses). The cellular uptake and cell viability assessment are also accomplished in cancerous and noncancerous cell lines to ensure the acceptability of this multifunctional biocomputing system, and the results are pretty satisfactory.

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The influence of size and localized defect states on photogenerated carrier recombination dynamics, which affects the performance of graphene quantum dots (GQDs)-based Si-compatible near-UV heterojunction photodetectors, is reported. GQDs of varying size from ∼3.0 to ∼8.0 nm have been prepared by a top-down method of oxidative cutting of graphene oxide followed by hydrothermal reduction and gradient centrifugation at different speeds. Structural, compositional, and photophysical characteristics as well as photocarrier dynamics of different sized samples have been studied. Spectroscopic features and carrier dynamics of GQDs are effectively controlled by their size and localized surface states, which also determine the average recombination lifetime of photogenerated carriers. Two-terminal vertical heterojunction photodetector devices fabricated by using solution-processed quantum dots exhibit superior performance over a broad spectrum with a peak response in the near-UV (380 nm) region. The device fabricated by using ∼6.0 nm diameter GQDs displayed the highest peak responsivity of 3.5 A/W, showing an interesting correlation with carrier dynamics. To our best knowledge, this is the only report in graphene quantum dots or carbon nanostructure genre showing the direct correlation between size of the quantum dots and localized surface states on photocarrier dynamics and consequential performance of photodetector devices.

A significantly improved silicon nanowire (SiNW)based broadband photodetector is obtained in this work using the core−shell structure of SiNWs with hydrothermally processed nitrogen doped graphene quantum dots (N-GQDs). The performance of the photodetector device is enhanced significantly by enlarging the effective surface area of the SiNW/N-GQD heterostructure by controlled KOH etching of SiNWs. In combination with SiNWs, low-cost hydrothermal processed N-GQDs are used as a light absorber in the UV region and also as an emitter in the visible region which is reabsorbed by the SiNWs to enhance the device performance. The SiNW/N-GQD heterostructure photodetector exhibits a large photocurrent to dark-current ratio (∼0.8 × 10 2 under zero bias and as high as ∼0.5 × 10 4 under −2 V bias for 2 min KOH etching), remarkably low dark current (∼55 nA under −2 V bias for 2 min KOH etching and is six orders lower compared to control SiNWs device), and significantly improved external quantum efficiency (EQE) exceeding 150% in the near IR and ∼500% at 460 nm wavelength in the visible region. Such higher EQE may arise due to the (i) enhanced optical absorption, (ii) suppressed dark current, (iii) photomultiplication of charge carriers because of the presence of trap states, and (iv) improved carrier transport and collection efficiency due to core−shell structure and nanoscale morphology control. It is expected that the reported SiNWs/N-GQDs core−shell heterostructure device might be useful for high-performance optoelectronic applications in the near future.

Carbon nanostructures technology has recently emerged as a key enabler for next-generation optoelectronic devices working in the deep UV region due to their excitonic absorption. Here, we report the fabrication of “orange juice” derived solution processed carbon nanodots (CNDs)/n-Si heterojunction showing broadband spectral response with a peak responsivity of ∼1.25 A/W in UV (∼300 nm) wavelength. The surface topography and chemical information on synthesized CNDs via a facile synthesis route have been characterized showing the presence of surface chemical states resulting broad optical emission. The CNDs/n-Si photodiode exhibits very low dark current (∼500 pA), excellent rectification ratio (∼5 × 103), and very good photomodulation in UV region. Our device exhibits better responsivity in DUV than state-of-the-art GaN based photodetectors. Solution-processability of the devices with superior optical properties of CNDs thus pave the way for future high-performance, low-cost DUV photodetectors.

Bacterial invasion is a serious concern during the wound healing process. The colonization of bacteria is mainly responsible for the pH fluctuation at the wound site. Therefore, the fabrication of a proper wound dressing material with antibacterial activity and pH monitoring ability is necessary to acquire a fast healing process. Therefore, this work is dedicated to designing a vitamin B12-loaded gelatin microsphere (MS) decorated with a carbon dot (CD) metal−organic framework (MOF) for simultaneous pH sensing and advanced wound closure application. The resultant MS portrayed a high specific surface area and a hierarchically porous structure. Furthermore, the surface of the resultant MS contained numerous carboxyl groups and amine groups whose deprotonation and protonation with the pH alternation are accountable for the pH-sensitive properties. The vitamin B12 release study was speedy from the MOF structure in an acidic medium, which was checked by gelatin coating, and a controlled drug release behavior was observed. The system showed excellent cytocompatibility toward the L929 cell line and remarkable antibacterial performance against Gramnegative Escherichia coli and Gram-positive Staphylococcus aureus. Furthermore, the combined effect of Zn 2+ , the imidazole unit, and CDs produces an outstanding bactericidal effect on the injury sites. Finally, the in vitro wound model suggests that the presence of the vitamin B12-loaded gelatin MS accelerates the proliferation of resident fibroblast L929 cells and causes tissue regeneration in a time-dependent manner. The relative wound area, % of wound closure, and wound healing speed values are remarkable and suggest the requirement for assessing the response of the system before exploiting its prospective in vivo application.