NH3-Sensing Mechanism Using Surface Acoustic Wave Sensor with AlO(OH) Film

In this study, AlO(OH) (boehmite) film was deposited onto a surface acoustic wave (SAW) resonator using a combined sol-gel and spin-coating technology, and prepared and used as a sensitive layer for a high-performance ammonia sensor. The prepared AlO(OH) film has a mesoporous structure and a good affinity to NH3 (ammonia gas) molecules, and thus can selectively adsorb and react with NH3. When exposed to ammonia gases, the SAW sensor shows an initial positive response of the frequency shift, and then a slight decrease of the frequency responses. The sensing mechanism of the NH3 sensor is based on the competition between mass-loading and elastic-loading effects. The sensor operated at room temperature shows a positive response of 1540 Hz to 10 ppm NH3, with excellent sensitivity, selectivity and stability

H2S gas sensing performance and mechanisms using CuO-Al2O3 composite films based on both surface acoustic wave and chemiresistor techniques

Surface acoustic wave and chemiresistor based gas sensors integrated with a sensing layer of sol-gel CuO-Al2O3 composite film were fabricated and their performance and mechanisms for H2S sensing were characterized and compared. In the composite film, CuO nanoparticles provide active sites for adsorption and reaction of H2S molecules while Al2O3 nanoparticles help to form a uniform and mesoporous film structure, both of which enhance the sensitivity of the sensors by providing numerous active CuO surfaces. Through the comparative studies, the SAW based H2S sensor operated at room temperature showed a lower detection limit, higher sensitivity, better linearity and good selectivity to H2S gas with its concentration ranging from 5 ppb to 100 ppm, compared with those of the chemiresistor sensor, which are mainly attributed to the effective mass sensing properties of the SAW sensor, because a minor change in the mass of the film caused by adsorbed H2S molecules would lead to a significant and monotonous change of the resonant frequency of the SAW devices

Early loss of Crebbp confers malignant stem cell properties on lymphoid progenitors.

Loss-of-function mutations of cyclic-AMP response element binding protein, binding protein (CREBBP) are prevalent in lymphoid malignancies. However, the tumour suppressor functions of CREBBP remain unclear. We demonstrate that loss of Crebbp in murine haematopoietic stem and progenitor cells (HSPCs) leads to increased development of B-cell lymphomas. This is preceded by accumulation of hyperproliferative lymphoid progenitors with a defective DNA damage response (DDR) due to a failure to acetylate p53. We identify a premalignant lymphoma stem cell population with decreased H3K27ac, which undergoes transcriptional and genetic evolution due to the altered DDR, resulting in lymphomagenesis. Importantly, when Crebbp is lost later in lymphopoiesis, cellular abnormalities are lost and tumour generation is attenuated. We also document that CREBBP mutations may occur in HSPCs from patients with CREBBP-mutated lymphoma. These data suggest that earlier loss of Crebbp is advantageous for lymphoid transformation and inform the cellular origins and subsequent evolution of lymphoid malignancies

Data for transcriptome and proteome analysis of Eucalyptus infected with Calonectria pseudoreteaudii

Cylindrocladium leaf blight is one of the most important diseases in Eucalyptus plantations. We investigated the proteome and transcriptome of Eucalyptus infected or not infected with Calonectria pseudoreteaudii. Here we provide the information about the processing of raw data obtained by RNA-seq and iTRAQ technologies. The data are related to [1]

High-Performance Co-Free Ruddlesden–Popper-Type Perovskites by In Situ-Controlled Exsolution-Defined Nanocomposites for Protonic Ceramic Fuel Cell Cathodes

Evolving protonic ceramic fuel cell (PCFC) cathodes require excellent oxygen reduction reactivity (ORR), high triple (H+/O2–/e–) conductivity, and adequate operational stability at intermediate-to-low temperatures. In this work, a brand new nanocomposite compound was designed by applying the cathodic surface modification method on A-site-deficient Ruddlesden–Popper-type (RP) Pr2.7Ni1.6Cu0.3Nb0.1O7‑δ (P2.7NCNO) possessing a triple-conducting property for PCFC cathodes. This nanocomposite contains the primary phase of the RP structure, with NiO nanoparticles evenly dispersed upon its surface. The ORR activity improves with polarization resistance reaching 0.25 Ω·cm2 at 600 °C. The quick charge transfer and oxygen surface exchange benefit from the Nb and Cu codoping and surface NiO nanoparticles based on distribution of relaxation time (DRT) analysis. Furthermore, P2.7NCNO exhibits higher proton conductivity under different atmospheres owing to Nb and Cu codoping. Excellent results are observed at 600 °C when used as the cathode in PCFC single cells, achieving a peak power density of 1024 mW·cm–2. Moreover, the P2.7NCNO sample exhibits appropriate endurance durability (600 mA·cm–2 at 600 °C for ∼130 h) and acceptable thermal compatibility with proton conductor electrolytes BaZr0.1Ce0.7Y0.1Yb0.1O3‑δ (BZCYYb) thanks to the Co-free structure. These results demonstrate that the surface modification strategy of proper composition manipulation on the RP structure provides useful guidance for future study and optimization for intermediate-to-low-temperature PCFC cathodes

Rational construction and triethylamine sensing performance of foam shaped a-MoO3@SnS2 nanosheets

Owing to their high surface area, stable structure and easy fabrication, composite nanomaterials with encapsulation structures have attracted considerable research interest as sensing materials to detect volatile organic compounds. Herein, a hydrothermal route is designed to prepare foam shaped α-MoO3@SnS2 nanosheets that exhibit excellent sensing performance for triethylamine (TEA). The developed sensor, based on α-MoO3@SnS2 nanosheets, displays a high response of 114.9 for 100 ppm TEA at a low working temperature of 175 °C with sensitivity higher than many other reported sensors. In addition, the device shows a wide concentration detection range (from 500 ppb to 500 ppm), good stability after exposure to air for 80 days, and excellent selectivity. The superior sensing characteristics of the developed sensor are attributed to the high crystallinity of α-MoO3/SnS2, excessive and accessible active sites provided by the good permeability of porous SnS2 shells, and the excellent conductivity of the encapsulation heterojunction structure. Thus, the foam shaped α-MoO3@SnS2 nanosheets presented herein have promising practical applications in TEA gas sensing devices.Scopu