# An in-silico study to design C60 fullerene-based nanosensors for the adsorption, detection, and removal of the narcotic drug γ-hydroxybutyric acid

## TL;DR

This study designs nanosensors using C60 fullerenes to detect and remove the drug GHB, offering a fast and reliable method for drug detection.

## Contribution

The novel contribution is the computational design and evaluation of fullerene-based nanosensors for GHB detection and removal.

## Key findings

- Boron-doped C60 (BC59) is best for electrochemical sensing of GHB due to conductivity and charge transfer behavior.
- Pure C60 is suitable for colorimetric detection due to a large spectral shift in the visible range.
- Zinc-doped C60 shows the best adsorption properties for GHB removal and purification.

## Abstract

γHydroxybutyric acid (GHB), a depressant of the central nervous system, is commonly used illegally and in drug-facilitated crimes; therefore, it is crucial to develop reliable and fast methods for detecting GHB. This study uses DFT theory to design and evaluate the performance of electrochemical and colorimetric nanosensors based on fullerene and its forms of doping with boron and zinc for GHB detection. The calculation results (bond length, HOMO-LUMO energy gap, infrared spectra and UV-visible absorption spectra) for C60 showed very good overlap with experimental results in other literature, indicating the validity of the computational method used in this work. Several analyses (such as electronic structure calculations, adsorption energy evaluation, charge-transfer analysis, NBO, NCI/RDG, ELF, LOL, QTAIM, conductivity, recovery time, and optical response analyses) were performed to investigate the sensor performance. After comparing these results, Boron-Doped C60 (BC59) was found to be the best candidate for electrochemical sensing of GHB based on conductivity modulation & charge transfer behavior. In contrast, pure C60 with the largest spectral shift (in the visible range) was introduced as a suitable candidate for colorimetric measurement. Zinc-doped C60 adsorbs GHB best (based on adsorption properties), making it suitable for GHB removal and adsorption in purification applications. Overall, this computational study makes experimental efforts more targeted by qualitatively assessing sensor performance and reducing trial and error, and provides clear guidance for future experimental validation and development of efficient GHB detection platforms.