Improvement of Sensing Properties for Copper Phthalocyanine Sensors Based on Polymer Nanofibers Scaffolds

Abstract

An effectual and understandable route for the fabrication techniques of stereoscopic NO2 sensor is provided in this work. As the gas-sensing layer of the sensor, copper phthalocyanine (CuPc) grew on the top of poly­(vinyl alcohol) (PVA) nanofibers (NFs). The sensitivity of the CuPc/PVA NFs stereoscopic sensors to NO2 was over 829%/ppm, while the sensitivity of the continuous CuPc films sensors was 2 orders of magnitude lower than that of the stereoscopic ones. To the responsivities at 25 ppm of NO2, the CuPc/PVA NFs stereoscopic sensors were about four times stronger than that of the continuous CuPc films sensors. For the recovery time, the CuPc/PVA NFs stereoscopic sensors were over eight times faster than the continuous CuPc films sensors. This general tactic can be used to prepare various toxic gas sensors to improve the overall performance of the devices.

Solution-processed filamentous copper phthalocyanine films for enhanced NO2 gas sensing at room temperature

“…It was consistent with the I – V characteristics of evaporated CuPc films and evaporated CuPc/PVA nanofibers films. 22 The response recovery curves of the filamentous CuPc films sensors to dynamic concentration NO 2 gas are shown in Fig. 6b and Fig.…”

“…2a-c, which were significantly different from the evaporation of CuPc films. 21,22 The films were filamentous with varying degrees of cracks. The CuPc films with a concentration of 45 mg mL À1 had a relatively large number of cracks.…”

“…The relative responsivity of 75 mg mL À1 CuPc film sensors to 20 ppm NO 2 gas was 32797%, which was 3 times that of traditional flat CuPc films sensors (10753%). 22 A sensitivity was defined as the slope of the linear relationship of responsivity versus NO 2 concentration. The sensitivity of the filamentous CuPc films sensors is shown in Fig.…”

Copper phthalocyanine modified hydrogel inverse opal beads for enhanced photocatalytic removal of dyes

“…In this work, silica colloidal crystal beads (SCCBs) were prepared by microfluidic technology, and the monomers were subjected to free radical polymerization in the channels of the SCCB sacrificial template under ultraviolet (UV) irradiation. Copper phthalocyanine (CuPc) with good thermal stability, chemical stability, photoconductivity, and semiconducting properties was selected as an organic photocatalyst, 39,40 and loaded onto porous hydrogels to endow it with visible light absorption ability and photocatalytic activity. The as-prepared CuPc modified poly(acrylamide- co -acrylic acid) (PACA) hydrogel inverse opal beads (CuPc-PACA HIOBs) had a distinct inverse opal structure, large specific surface area, and excellent hydrophilic properties, which was conducive to the continuous delivery of various organic dyes to the inner pores of the hydrogel.…”

Opposite Sensing Response of Heterojunction Gas Sensors Based on SnO2–Cr2O3 Nanocomposites to H2 against CO and Its Selectivity Mechanism

“…So far, no efficient strategy is reported to selectively evaluate the sensing response to each gas separately . Other developments largely focused on the enhancement in the selectivity of the target gases using p–n composites, , modulating the basicity and acidity of the materials surface, doping or loading elements, modulating the temperature, choosing the optimal operating temperature, employing a selective catalytic layer, and so on. − Among them, the p–n junction has been widely reported to enhance the sensing performance of semiconductor-based gas sensors. However, most of the previous reports focused on the enhancement of sensing behavior to the target gas, and the interesting opposite sensing response behavior of a single sensing material to two homogeneous gases is rarely reported, − as demonstrated in Table .…”