AMMONIA AND NITROGEN DIOXIDE DETECTION USING LOW-BANDGAP POLYMER-BASED SENSITIVE SURFACE

Marcelo Soares Borro; Maria Luisa Braunger; Edilene de Assunção da Silva; Roger Clive Hiorns; Caroline Duc; Nadine Locoge; Clarissa A. Olivati

Todos os Trabalhos

Trabalho

Título do Trabalho

AMMONIA AND NITROGEN DIOXIDE DETECTION USING LOW-BANDGAP POLYMER-BASED SENSITIVE SURFACE

Autores

Marcelo Soares Borro
Maria Luisa Braunger
Edilene de Assunção da Silva
Roger Clive Hiorns
Caroline Duc
Nadine Locoge
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-2026/1462496-ammonia-and-nitrogen-dioxide-detection-using-low-bandgap-polymer-based-sensitive-surface

ISBN

978-65-272-2467-9

Palavras-Chave

Low-bandgap polymer, chemiresistive sensor, ammonia, nitrogen dioxide

Resumo

Ammonia (NH3) and nitrogen dioxide (NO2) are hazardous compounds commonly found in industrial and household environments, making their detection essential due to their significant environmental impact and high toxicity. As an alternative to inorganic materials, such as metal-oxide semiconductors (MOS), conductive polymers (CPs) have emerged due to their low cost, high sensitivity, and room-temperature operation. Among CPs, low-bandgap polymers are evaluated in gas sensing due to their low-energy electronic structure, which may facilitate significant and detectable changes in conductivity upon interaction with gas molecules. Although sensors based on low-bandgap polymers toward NH3 detection have already been reported [1], their performance as chemiresistive sensors remains underexplored. In this work, sensitive sensors to NH3 and NO2 based on the low bandgap polymer poly[4,4' diethylhexyl 4H cyclopenta[2,1 b;3,4 b']dithiophene alt 2,5 didodecyl 3,6 bis(thiophen-2-yl)pyrrolo[3,4-c]-pyrrole-1,4-dione] (PCPDTDPP_C12) are proposed. The devices were fabricated by drop-casting onto interdigitated electrodes and evaluated through exposure protocols toward NH3 and NO2 at 6%, 42%, and 53% relative humidity (RH). The sensors exhibited opposite responses to each analyte: an increase in resistance for NH3 and a decrease in resistance for NO2, consistent with p-type semiconductor behavior for reacting and oxidizing analytes. For NH3, the highest sensitivity (0.128 ± 0.065 %/ppb) was obtained at 42% RH, with a limit of detection (LOD) of 7 ppb and high repeatability (2.3%). For NO2, the highest sensitivity (-0.135 ± 0.006 %/ppb) was at 6% RH, with a 9 ppb LOD achieved. In both cases, humidity affected the sensors’ behavior. Overall, the PCPDTDPP_C12 polymer demonstrates the potential as chemiresistive gas sensors at room temperature sensing, working as a proof of concept as detectors of NH3 and NO2 at ppb levels. Acknowledgements: The authors are grateful for financial support from the São Paulo Research Foundation (FAPESP, Grant No. 2022/04424-9, 2023/04442-0), and FAPESP Grant No. 2025/27044-5) and the National Council for Scientific and Technological Development (CNPq, Grant No. 408449/2024-1, INEO). The authors also thank the National Nanotechnology Laboratory (LNNano/CNPEM, project LMF 2023090) for providing the Interdigitated Electrodes (IDEs). References: [1] Z. Wang, Z. Liu et al, Advanced Electronic Materials Vol.4, Issue 5, 1800025 (2018)

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

BORRO, Marcelo Soares et al.. AMMONIA AND NITROGEN DIOXIDE DETECTION USING LOW-BANDGAP POLYMER-BASED SENSITIVE SURFACE.. 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-2026/1462496-AMMONIA-AND-NITROGEN-DIOXIDE-DETECTION-USING-LOW-BANDGAP-POLYMER-BASED-SENSITIVE-SURFACE. Acesso em: 10/08/2026