FABRICATION AND CHARACTERIZATION OF HUMIDITY SENSORS BASED ON NON-FULLERENE ORGANIC SEMICONDUCTORS

Maria Eduarda Rocha Santos Medina; Marcelo Soares Borro; Maiza da Silva Ozorio; Neri Alves; Clarissa A. Olivati

Todos os Trabalhos

Trabalho

Título do Trabalho

FABRICATION AND CHARACTERIZATION OF HUMIDITY SENSORS BASED ON NON-FULLERENE ORGANIC SEMICONDUCTORS

Autores

Maria Eduarda Rocha Santos Medina
Marcelo Soares Borro
Maiza da Silva Ozorio
Neri Alves
Clarissa A. Olivati

Modalidade

Pôster - resumo

Área temática

Sensores e biossensores

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1462454-fabrication-and-characterization-of-humidity-sensors-based-on-non-fullerene-organic-semiconductors

ISBN

978-65-272-2467-9

Palavras-Chave

thin films, non-fullerene acceptors, humidity sensor

Resumo

Precise monitoring of relative humidity (RH) is a critical requirement in advanced instrumentation, where atmospheric moisture levels directly influence the stability of food preservation, biochemical and industrial processes control. Unlike the detection of hazardous gaseous analytes, RH sensing is indispensable for maintaining the operational integrity of moisture-sensitive electronic devices and ensuring thermodynamic equilibrium in controlled environments. Consequently, there is an intensifying demand for sensing platforms characterized by high sensitivity, low-cost fabrication, and fast signal transduction[1]. In this context, conducting polymers (CPs) and organic semiconductors have emerged as promising materials due to their ability to interact with water molecules at room temperature, reversibly altering their electrical properties. Furthermore, the nature of these materials allows for solution-based processing, facilitating the large-scale production of flexible and wearable devices [2]. A significant innovation of this work lies in the strategic application of non-fullerene electron acceptors (NFAs) as gas sensing devices, which are beyond the traditional application area. While these materials have revolutionized organic solar cell efficiency, their electron affinity opens new avenues for diverse electronic architectures. In this study, thin-film devices based on non-fullerene organic semiconductors were fabricated for application as humidity sensors. The sensor architecture was explored through different deposition methodologies, aiming to optimize the active layer morphology and the electrode interface. We compared the techniques of Langmuir-Schaefer (LS), which offers nanometric molecular control; drop-casting, for its simplicity and technical feasibility; and the use of decorated nanofibers, aiming to increase the surface area to optimize the adsorption and desorption kinetics of water molecules. The devices were characterized through direct current (DC) electrical measurements, evaluating critical parameters such as relative response, stability, reversibility, and response time. Regardless of the fabrication technique, a substantial enhancement in electrical current was observed upon exposure to water vapor, coupled with excellent reversibility. Specifically, the devices exhibited over 90% reversibility; however, the film fabricated by LS displayed the lowest coefficient of variation (CoV), at approximately 15%, between cycles, a value considered acceptable for gas sensing applications. These distinct CoV levels among the fabrication techniques (LS, decorated nanofibers, and drop-casting) arise from the different morphologies formed, as the structural organization of the active layer directly dictates the reproducibility of the sensing response. These results demonstrate the potential of non-fullerene semiconductors for a new generation of high-performance environmental sensors. References: 1. DAI, J. et al. Preparation of organic-inorganic hybrid polymers and their humidity sensing properties. Sensors and Actuators B: Chemical, v. 242, p. 1108–1114, 2017. 2. CHENG, P. et al. Next-generation organic photovoltaics based on non-fullerene acceptors. Nature Photonics, v. 12, n. 3, p. 131–142, 2018. Acknowledgments: The authors are grateful for the financial support from the São Paulo Research Foundation, FAPESP (Grant No. 2024/22327-6), and the National Council for Scientific and Technological Development (CNPq, INEO). The authors also thank the National Nanotechnology Laboratory (LNNano/CNPEM, project LMF 2023090) for providing the Interdigitated Electrodes (IDEs).

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

MEDINA, Maria Eduarda Rocha Santos et al.. FABRICATION AND CHARACTERIZATION OF HUMIDITY SENSORS BASED ON NON-FULLERENE ORGANIC SEMICONDUCTORS.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1462454-FABRICATION-AND-CHARACTERIZATION-OF-HUMIDITY-SENSORS-BASED-ON-NON-FULLERENE-ORGANIC-SEMICONDUCTORS. Acesso em: 10/08/2026