H2S-Sensing Studies Using Interdigitated Electrode with Spin-Coated Carbon Aerogel-Polyaniline Composites

Bibi, Aamna; Rubio, Yuola Rose M.; Santiago, Karen S.; Jia, His-Wei; Ahmed, Mahmoud M.; Lin, Yi‐Feng; Yeh, Jui‐Ming

doi:10.3390/polym13091457

Cited by 17 publications

(11 citation statements)

References 47 publications

(47 reference statements)

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“…Another example of a sensor reported for the detection of humidity and ammonia was fabricated using carbon nanofibers (CNFs), PANI and PVA [ 12 ]. Other types of gas sensors were recently reported that include an H 2 S sensor based on carbon aerogel (CA) and PANI [ 150 ], and a CO 2 sensor comprising graphene (G)/PANI [ 151 ].…”

Section: Carbon-based Humidity Sensorsmentioning

confidence: 99%

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Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

et al. 2021

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The development of polyaniline (PANI)/biomaterial composites as humidity sensor materials represents an emerging area of advanced materials with promising applications. The increasing attention to biopolymer materials as desiccants for humidity sensor components can be explained by their sustainability and propensity to absorb water. This review represents a literature survey, covering the last decade, which is focused on the interrelationship between the core properties and moisture responsiveness of multicomponent polymer/biomaterial composites. This contribution provides an overview of humidity-sensing materials and the corresponding sensors that emphasize the resistive (impedance) type of PANI devices. The key physicochemical properties that affect moisture sensitivity include the following: swelling, water vapor adsorption capacity, porosity, electrical conductivity, and enthalpies of adsorption and vaporization. Some key features of humidity-sensing materials involve the response time, recovery time, and hysteresis error. This work presents a discussion on various types of humidity-responsive composite materials that contain PANI and biopolymers, such as cellulose, chitosan and structurally related systems, along with a brief overview of carbonaceous and ceramic materials. The effect of additive components, such as polyvinyl alcohol (PVA), for film fabrication and their adsorption properties are also discussed. The mechanisms of hydration and proton transfer, as well as the relationship with conductivity is discussed. The literature survey on hydration reveals that the textural properties (surface area and pore structure) of a material, along with the hydrophile–lipophile balance (HLB) play a crucial role. The role of HLB is important in PANI/biopolymer materials for understanding hydration phenomena and hydrophobic effects. Fundamental aspects of hydration studies that are relevant to humidity sensor materials are reviewed. The experimental design of humidity sensor materials is described, and their relevant physicochemical characterization methods are covered, along with some perspectives on future directions in research on PANI-based humidity sensors.

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Section: Carbon-based Humidity Sensorsmentioning

confidence: 99%

“…For example, carbon aerogel materials possess enormous porosity, whereby such types of sensors exhibit an extremely fast response and very slow recovery (cf. Table 6 ) [ 150 ].…”

Section: Carbon-based Humidity Sensorsmentioning

confidence: 99%

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

et al. 2021

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“…They explained that aerogel-based composites were first applied on the interdigitated electrode made of glass. Carbon aerogels were dispersed with the spin-coating method on the electrode for gas sensing [ 103 ].…”

Section: Applications Of Aerogelsmentioning

confidence: 99%

Aerogels for Biomedical, Energy and Sensing Applications

Noman

Amor

Ali

et al. 2021

Gels

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The term aerogel is used for unique solid-state structures composed of three-dimensional (3D) interconnected networks filled with a huge amount of air. These air-filled pores enhance the physicochemical properties and the structural characteristics in macroscale as well as integrate typical characteristics of aerogels, e.g., low density, high porosity and some specific properties of their constituents. These characteristics equip aerogels for highly sensitive and highly selective sensing and energy materials, e.g., biosensors, gas sensors, pressure and strain sensors, supercapacitors, catalysts and ion batteries, etc. In recent years, considerable research efforts are devoted towards the applications of aerogels and promising results have been achieved and reported. In this thematic issue, ground-breaking and recent advances in the field of biomedical, energy and sensing are presented and discussed in detail. In addition, some other perspectives and recent challenges for the synthesis of high performance and low-cost aerogels and their applications are also summarized.

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“…Nowadays, polyaniline emeraldine salt (PANI) presents encouraging gas sensing properties among the functional materials due to the adjustable conductivity via ion doping, tunable degree of the oxidation/reduction state, and compatible growth on the substrate. − Despite the good H 2 S sensing performances reported previously, the low sensitivity of pristine PANI still needs to be enhanced. Hence, the developments of PANI-based nanocomposite materials, including PANI–carbon materials, , PANI–MOSs, , PANI–noble metals, , and PANI–transition metal salts − have been intensively investigated for further improvement of the H 2 S sensing properties. Most of them are focused on the formation of the p–n or Schottky junction on the interfaces of PANI rather than the selection of H 2 S-sensitive functional materials; therefore, the restricted sensing performances of PANI-based sensors still need to be enhanced.…”

Section: Introductionmentioning

confidence: 99%

Designing Cu²⁺ as a Partial Substitution of Protons in Polyaniline Emeraldine Salt: Room-Temperature-Recoverable H₂S Sensing Properties and Mechanism Study

Liu

Duan

Yuan

et al. 2022

ACS Appl. Mater. Interfaces

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Hydrogen sulfide (H 2 S) sensors are in urgent demand in the field of hermetic environment detection and metabolic disease diagnosis. However, most of the reported roomtemperature (RT) H 2 S sensors based on transition metal oxides/ salts unavoidably suffer from the poisoning effect, resulting in the unrecoverable behavior to restrain their application. Herein, copper(II) chloride-doped polyaniline emeraldine salt (PANI-CuCl 2 ) was devised for RT-recoverable H 2 S detection, where the copper ion (Cu 2+ ) was designed as a partial substitution of protons (H + ) in PANI. The prepared gas sensor exhibited full recovery capability toward 0.25−10 ppm H 2 S, good repeatability, and longterm stability under 80% RH. Meanwhile, the changes of the PANI-CuCl 2 during the H 2 S sensing period were analyzed via multiple analytical methods to reveal the reversible sensing behavior. Results showed that doping of Cu 2+ not only promoted the PANI's response through the formation of conductive copper sulfide (CuS) and following H + redoping in the PANI but also facilitated the sensor's recovery behavior because of the Cu 2+ regeneration under the H + /oxygen environment. This work not only proves the changes of the interaction between the PANI and Cu 2+ during the H 2 S sensing period but also sheds light on designing recoverable H 2 S sensors based on transition metal salts.

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H2S-Sensing Studies Using Interdigitated Electrode with Spin-Coated Carbon Aerogel-Polyaniline Composites

Cited by 17 publications

References 47 publications

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

Aerogels for Biomedical, Energy and Sensing Applications

Designing Cu²⁺ as a Partial Substitution of Protons in Polyaniline Emeraldine Salt: Room-Temperature-Recoverable H₂S Sensing Properties and Mechanism Study

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H2S-Sensing Studies Using Interdigitated Electrode with Spin-Coated Carbon Aerogel-Polyaniline Composites

Cited by 17 publications

References 47 publications

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

Aerogels for Biomedical, Energy and Sensing Applications

Designing Cu2+ as a Partial Substitution of Protons in Polyaniline Emeraldine Salt: Room-Temperature-Recoverable H2S Sensing Properties and Mechanism Study

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About

Designing Cu²⁺ as a Partial Substitution of Protons in Polyaniline Emeraldine Salt: Room-Temperature-Recoverable H₂S Sensing Properties and Mechanism Study