22. Self-Correction of pH-Induced Signal Variations in Methylene Blue-Labeled Aptamer Electrochemical Biosensors: Wearable Cortisol Detection in Sweat
Barak Sabbagh†, Muhammad Inam Khan†, Gyeongho Kim, Ponnusamy Nandhakumar, Lauren Chiu, Hao Zheng, Avani Jakasania, Victor Perez, Tamoghna Saha, Minjoon Park, and Joseph Wang*
ACS. Sensors. 2026, 11, 4, 3505–3515 [Link]
21. Automated dip-coating surface modification system for microneedle sensors
Maria Reynoso†, Stacey Surace†, Chochanon Moonla†, Nuenghathai Chaiya, An-Yi Chang, Ponnusamy Nandhakumar, Gyeongho Kim, Ian Mcgregor, Lidia F. Vazquez, Joseph Wang*
Device 2026, 4, 1, 100969 [Link]
20. Rapid and Continuous Simultaneous Monitoring of Interleukin-6 and Lactate Using a Bioelectronic Sensor Platform: toward Early Sepsis Prediction
Ponnusamy Nandhakumar†, Gyeongho Kim†, Samar S. Sandhu†, Maria Reynoso†, Muhammad Inam Khan, Ada Raucci, Xuecheng He, Beatrice Acot, Rhea Park, Stacey Surace, Ga-Eun Kim, Joseph Wang*
Anal. Chem. 2025, 97, 33, 18273-18281 [Link]
19. A Touch Enabled Hemodynamic and Metabolic Monitor
Omeed Djassemi†, Tamoghna Saha†, Ponnusamy Nandhakumar†, Muhammad Inam Khan, Hannah Fishman, Sara Earney, Chochanon Moonla, Yuchen Xu, Henry Thai, Sofia Morales-Fermin, Gyeongho Kim, Rhea Park, Beya Acot, Oscar Wu, Cannon Wurster, An-Yi Chang, Christopher Cheung, Julia Silberman, Shichao Ding, and Joseph Wang*
Adv. Sci. 2025, 2502138 [Link]
18. Ferrocenyl Compounds as Alternative Redox Labels for Robust and Versatile Electrochemical Aptamer-Based Sensors
Gyeongho Kim†, Soo Eun Park†, Woohyeong Lee†, Jung Min Joo*, and Haesik Yang*
ACS Sensors. 2024, 9, 12, 6450-6459 [Link]
17. Proteolytic reaction-based versatile electrochemical biosensor chip for simple and quantitative point-of-care testing
Seonhwa Park, Gyeongho Kim, and Haesik Yang*
Sens. Actuators B: Chem. 2024, 414, 135934 [Link]
16. Electrochemical biosensor using direct electron transfer and an antibody–aptamer hybrid sandwich for target detection in complex biological samples
Gyeongho Kim and Haesik Yang*
Biosens. Bioelectron. 2024, 253, 116184 [Link]
15. Low-interference and sensitive electrochemical detection of glucose and lactate using boron-doped diamond electrode and electron mediator menadione
Nakyeong Yoon†, Youngjin Jung†, Gyeongho Kim, Jungwook Kwon, and Haesik Yang*
Anal. Sci. 2024, 40, 853-861 [Link]
14. Exploring synthetic strategies for 1H-indazoles and their N-oxides: electrochemical synthesis of 1H-indazole N-oxides and their divergent C−H functionalizations
Sagar Arepally, Taehoon Kim, Gyeongho Kim, Haesik Yang, and Jin Kyoon Park*
Angew. Chem. Int. Ed. 2023, 62, 26, e202303460 [Link]
13. Dicarboxylate-containing and fully substituted ferrocene with rapid dissolvability, high solubility, good stability, and moderate formal potential for mediated electrochemical detection
Woohyeong Lee†, Aman Bhatia†, Ponnusamy Nandhakumar†, Gyeongho Kim, Jung Min Joo* and Haesik Yang*
J. Mater. Chem. B, 2023, 11, 2258-2265 [Link]
12. Unified electrochemical synthetic strategy for [2 + 2 + 2] cyclotrimerizations: construction of 1,3,5- and 1,2,4-trisubstituted benzenes from Ni(I)-mediated reduction of alkynes
Sagar Arepally†, Ponnusamy Nandhakumar†, Gisela A. González-Montiel†, Alina Dzhaparova, Gyeongho Kim, Ahyeon Ma, Ki Min Nam, Haesik Yang*, Paul Ha-Yeon Cheong*, and Jin Kyoon Park*
ACS Catal. 2022, 12, 12, 6874–6886 [Link]
11. Wash-free, sandwich-type protein detection using direct electron transfer and catalytic signal amplification of multiple redox labels
Gyeongho Kim, Hyejin Cho, Ponnusamy Nandhakumar, Jin Kyoon Park, Kwang-sun Kim, and Haesik Yang*
Anal. Chem. 2022, 94, 4, 2163–2171 [Link]
10. Simple and fast Ag deposition method using a redox enzyme label and quinone substrate for the sensitive electrochemical detection of thyroid-stimulating hormone
Aman Bhatia, Ponnusamy Nandhakumar, Gyeongho Kim, Nam-Sihk Lee, Young Ho Yoon, and Haesik Yang*
Biosens. Bioelectron. 2022, 197, 113773 [Link]
9. Di(thioether sulfonate)-substituted quinolinedione as a rapidly dissoluble and stable electron mediator and its application in sensitive biosensors
Ponnusamy Nandhakumar†, Woohyeong Lee†, Sangwook Nam, Aman Bhatia, Jia Seo, Gyeongho Kim, Nam-Sihk Lee, Young Ho Yoon, Jung Min Joo*, and Haesik Yang*
Adv. Healthc. Mater. 2022, 11, 2, 2101819 [Link]
8. Sensitive and low-background electrochemical immunosensor employing glucose dehydrogenase and 1,10-Phenanthroline-5,6-dione
Al-Monsur Jiaul Haque, Jungwook Kwon, Jihyeon Kim, Gyeongho Kim, Nam-Sihk Lee, Young Ho Yoon, and Haesik Yang*
Electroanalysis 2021, 33, 8, 1877-1885 [Link]
7. Solid-phase recombinase polymerase amplification using an extremely low concentration of a solution primer for sensitive electrochemical detection of hepatitis B viral DNA
Andi Muhammad Ichzan, Sang-Hyun Hwang, Hyejin Cho, Chiew San Fang, Seonhwa Park, Gyeongho Kim, Jihyeon Kim, Ponnusamy Nandhakumar, Byeongjun Yu, Sangyong Jon, Kwang-sun Kim*, and Haesik Yang*
Biosens. Bioelectron. 2021, 179, 113065 [Link]
6. Interference-free duplex detection of total and active enzyme concentrations at a single working electrode
Seonhwa Park, Jeonghwa Shin, Jungwook Kwon, Woohyeong Lee, Jihyeon Kim, Gyeongho Kim, Jung Min Joo, and Haesik Yang*
ACS Sens. 2021, 6, 3, 1305–1311 [Link]
5. Metal nanozyme with ester hydrolysis activity in the presence of ammonia–borane and its use in a sensitive immunosensor
Ponnusamy Nandhakumar, Gyeongho Kim, Seonhwa Park, Seonghye Kim, Suhkmann Kim, Jin Kyoon Park, Nam-Sihk Lee, Young Ho Yoon, and Haesik Yang*
Angew. Chem. Int. Ed. 2020, 59, 50, 22419-22422 [Link]
4. Simple electrochemical method for monitoring the time-dependent dissolution behavior of layers deposited by atomic layer deposition
Gyeongho Kim, Chang-Min Kim, Jinkyo Jeong, Hyun Jae Woo, Se-Hun Kwon*, and Haesik Yang*
J. Electroanal. Chem. 2020, 877, 114550 [Link]
3. Diaphorase-catalyzed formation of a formazan precipitate and its electrodissolution for sensitive affinity biosensors
Al-Monsur Jiaul Haque, Ponnusamy Nandhakumar, Gyeongho Kim, Seonhwa Park, Byeongjun Yu, Nam-Sihk Lee, Young Ho Yoon, Sangyong Jon, and Haesik Yang*
Anal. Chem. 2020, 92, 5, 3932–3939 [Link]
2. Ultrasensitive detection of parathyroid hormone through fast silver deposition induced by enzymatic nitroso reduction and redox cycling
Aman Bhatia, Ponnusamy Nandhakumar, Gyeongho Kim, Jihyeon Kim, Nam-Sihk Lee, Young Ho Yoon, and Haesik Yang*
ACS Sens. 2019, 4, 6, 1641–1647 [Link]
1. Combined signal amplification using a propagating cascade reaction and a redox cycling reaction for sensitive thyroid-stimulating hormone detection
Seonhwa Park, Jihyeon Kim, Seheon Kim, Gyeongho Kim, Nam-Sihk Lee, Young Ho Yoon, and Haesik Yang*
Anal. Chem. 2019, 91, 12, 7894–7901 [Link]