Phase, microstructural analysis, and humidity-sensing properties of orange dye and cuprous-oxide composite

Karimov, Khasan S.; Saleem, M.; Iqbal, Yaseen; Fatima, Noshin; Gohar, Rashid

doi:10.1007/s00339-017-1343-1

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…As a consequence, proton exchange takes place between adsorbed H 2 O molecules and GQDs, resulting in an increase in conductance [29,[38][39][40]. Proton exchange affirms that ionic polarization also occurs between GQDs and H 2 O molecules [28,41]. This proton exchange, or ionic polarization, contributes towards an increase in capacitance output, especially at lower frequency (consult figures 5(b)-7(b) and 8).…”

Section: Discussionmentioning

confidence: 83%

Evaluating humidity sensing response of graphene quantum dots synthesized by hydrothermal treatment of glucose

et al. 2021

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Graphene quantum dots (GQDs) were prepared using a single-step hydrothermal treatment of glucose (C6H12O6) powder. X-ray diffraction patterns confirmed the random stacking or amorphous character of GQDs. Additionally, the UV-vis spectra confirmed the formation of GQDs with evident absorption peaks at 237 and 305 nm, which is attributed to π- π* and n- π* transitions correspondingly. The average size and surface roughness of graphene quantum dots were estimated by atomic force microscopy images and found to be 27.0 ± 1.0 and 2.3 nm, respectively. Afterwards, the effect of increasing relative humidity (RH) from 0%–95%, and frequency, was analyzed using the capacitive and resistive responses of synthesized GQDs. The capacitive output at 0.1 kHz revealed that initially capacitance remains constant (15.0 ± 1.0 pF) up to a humidity level ranging between 0%–50%. Likewise, capacitance also displayed stabilized behavior after frequency levels were increased i.e., 1.0 and 10 kHz, at a humidity ranging from 0%–55%. Moreover, capacitance showed a 115,455, 22,480 and 3,620% improvement from their stable values at each respective frequency level i.e., 0.1, 1.0 and 10 kHz. The capacitive sensitivity decreased to 84.20 and 96.83% at greater frequencies (1.0 and 10 kHz) in comparison to the sensitivity at 0.1 kHz facing similar variations in a humid environment. In contrast, resistance displayed an exponential decline by 99.9900, 99.9796 and 99.9925%, accordingly, when RH increases from 0 to 95% at 0.1, 1.0 and 10 kHz, respectively. However, with the rise in frequency level from 0.1 to 1.0 kHz, resistive sensitivity increased considerably to 69 and 158.5%, respectively, in two prominent humidity ranges i.e., 0 ≤ RH ≤ 25% and 25% ≤ RH ≤ 50%. A further increase in testing frequency to 10 kHz enhances the resistive sensitivity by 598.5 and 178.5% when compared with the lowest sensitivity values at two noticeable humidity levels, 0%–25% and 25%–50%. The response and recovery times of our specimen were better than most of previously fabricated GQDs and other carbon-derived nanomaterials, which makes the nano-GQDs of our study more suitable for RH sensor application.

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Section: Discussionmentioning

confidence: 83%

Evaluating humidity sensing response of graphene quantum dots synthesized by hydrothermal treatment of glucose

et al. 2021

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“…These peaks and other peaks present in the rubber X-ray diffractogram are characteristics of polyvinyl chloride that match perfectly with the ICDD datthe results showed a maximum of 150 V openabase (PDF # 00-064-1628) and correspond to the high amount of structural arrangement (order) in its polymeric chains. 22,47 In the CNT After the structural characterisation of the device, its electric characteristics were analysed. Results were obtained as a function of longitudinal and transversal stress over the proposed sensor, as presented in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Flexible longitudinal and transversal displacement sensors based on a composite of CI Disperse Orange 25 and carbon nanotubes

Ullah

Karimov

Ibrahim

et al. 2021

Coloration Technology

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This paper presents the proposal and characterisation of a flexible, shockproof, vibration-free, longitudinal and transversal compressive displacement sensor based on a composite of CI Disperse Orange 25 and carbon nanotubes created with an energy-free, drop-casting technique. The structural morphology of each layer is studied briefly through X-ray diffraction. Electric investigations of the sensors in the form of impedance were performed as a function of longitudinal and transversal compressive displacement at three different frequencies. The compressive displacements were measured from 0 to 250 µm at three fixed frequencies (ie, 1, 10 and 200 kHz). The impedance has an inverse relationship with longitudinal compressive displacement but a direct relationship with transversal compressive displacement. The frequency to impedance relationship is inverse with the sensitivity of the impedance as a function of longitudinal displacement. Because of their small size, light weight and simple fabrication technique and design, as well as their low cost and maintenance, these types of devices can be utilised across a wide range of medical applications, such as in rehabilitation centres, for machine status assessment during physiotherapy, and in robotic body parts, as well as for educational purposes in universities.

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“…The manufacturing and investigation of devices for measuring force [ 1 , 2 ], acceleration [ 3 , 4 ], and temperature [ 5 , 6 ] are crucial for two reasons: first, for practical applications, and second, for the development of relevant technology in the near future of biotechnology [ 7 ]. Based on cost and impedance matching, a systematic method was devised for selecting force and acceleration sensors [ 8 , 9 , 10 , 11 ] based on their electrical and mechanical qualities.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Investigation of Graphite-Flake-Composite-Based Non-Invasive Flex Multi-Functional Force, Acceleration, and Thermal Sensor

et al. 2023

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This work examines the physics of a non-invasive multi-functional elastic thin-film graphite flake–isoprene sulfone composite sensor. The strain design and electrical characterization of the stretching force, acceleration, and temperature were performed. The rub-in technique was used to fabricate graphite flakes and isoprene sulfone into sensors, which were then analyzed for their morphology using methods such as SEM, AFM, X-ray diffraction, and Fourier transform infrared spectroscopy to examine the device’s surface and structure. Sensor impedance was measured from DC to 200 kHz at up to 20 gf, 20 m/s2, and 26–60 °C. Sensor resistance and impedance to stretching force and acceleration at DC and 200 Hz rose 2.4- and 2.6-fold and 2.01- and 2.06-fold, respectively. Temperature-measuring devices demonstrated 2.65- and 2.8-fold decreases in resistance and impedance at DC and 200 kHz, respectively. First, altering the graphite flake composite particle spacing may modify electronic parameters in the suggested multi-functional sensors under stress and acceleration. Second, the temperature impacts particle and isoprene sulfone properties. Due to their fabrication using an inexpensive deposition technique, these devices are environmentally friendly, are simple to build, and may be used in university research in international poverty-line nations. In scientific laboratories, such devices can be used to teach students how various materials respond to varying environmental circumstances. They may also monitor individuals undergoing physiotherapy and vibrating surfaces in a controlled setting to prevent public health risks.

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Phase, microstructural analysis, and humidity-sensing properties of orange dye and cuprous-oxide composite

Cited by 9 publications

References 23 publications

Evaluating humidity sensing response of graphene quantum dots synthesized by hydrothermal treatment of glucose

Evaluating humidity sensing response of graphene quantum dots synthesized by hydrothermal treatment of glucose

Flexible longitudinal and transversal displacement sensors based on a composite of CI Disperse Orange 25 and carbon nanotubes

Fabrication and Investigation of Graphite-Flake-Composite-Based Non-Invasive Flex Multi-Functional Force, Acceleration, and Thermal Sensor

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