Publication
Seed-directed growth of gold nanostars on paper via inkjet-printing for the development of a sensitive glucose sensor
| Summary: | This study presents a reliable, biodegradable, and cost-effective colorimetric glucose sensor developed through the in situ growth of nanostar-shaped gold nanostructures on a paper-based analytical device (PAD). Gold seeds were precisely deposited onto cellulose fibers via inkjet printing, enabling controlled growth through a seed-mediated approach, with adenosine monophosphate (AMP) acting as a morphology-directing agent. The localized and controlled growth of these nanostructures within the cellulose matrix ensures a uniform nanocatalytic surface, while maintaining the scalability and reproducibility required for low-cost sensor fabrication. The optimized PAD exhibited a homogeneous plasmonic surface, allowing for sensitive glucose detection through visible color changes. A linear response was achieved over a glucose concentration range of 1 to 200 µM, with a detection limit of 0.56 µM, highlighting its potential for Point-Of-Care (POC) diagnostic applications. The resulting PAD also offers a portable and multifunctional platform for colorimetric glucose analysis. Furthermore, its practical design and robust performance enable real-time glucose monitoring using only a smartphone to capture the PAD’s color change and correlate it with the glucose concentration. |
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| Main Authors: | Ortiz-Gómez, Inmaculada |
| Other Authors: | Celis, Francisco Calderón; Costa-Fernández, José Manuel; Fernández-Lodeiro, Carlos; Lodeiro, Carlos; Fernández-Lodeiro, Javier |
| Subject: | Colorimetric sensor Glucose Gold nanostars Inkjet printing Paper-based device Seed-mediated growth Analytical Chemistry |
| Year: | 2025 |
| Country: | Portugal |
| Document type: | article |
| Access type: | open access |
| Associated institution: | Universidade Nova de Lisboa |
| Language: | English |
| Origin: | Repositório Institucional da UNL |
| Summary: | This study presents a reliable, biodegradable, and cost-effective colorimetric glucose sensor developed through the in situ growth of nanostar-shaped gold nanostructures on a paper-based analytical device (PAD). Gold seeds were precisely deposited onto cellulose fibers via inkjet printing, enabling controlled growth through a seed-mediated approach, with adenosine monophosphate (AMP) acting as a morphology-directing agent. The localized and controlled growth of these nanostructures within the cellulose matrix ensures a uniform nanocatalytic surface, while maintaining the scalability and reproducibility required for low-cost sensor fabrication. The optimized PAD exhibited a homogeneous plasmonic surface, allowing for sensitive glucose detection through visible color changes. A linear response was achieved over a glucose concentration range of 1 to 200 µM, with a detection limit of 0.56 µM, highlighting its potential for Point-Of-Care (POC) diagnostic applications. The resulting PAD also offers a portable and multifunctional platform for colorimetric glucose analysis. Furthermore, its practical design and robust performance enable real-time glucose monitoring using only a smartphone to capture the PAD’s color change and correlate it with the glucose concentration. |
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