Highly sensitive and selective detection of beryllium ions using a microcantilever modified with benzo-9-crown-3 doped hydrogel

Abstract

A microcantilever sensor modified by chitosan/gelatin hydrogels that are doped with benzo-9-crown-3 has been developed for the sensitive and selective detection of beryllium ions in an aqueous solution. The microcantilever undergoes bending deflection upon exposure to Be(2+) due to selective absorption of Be(2+) in the hydrogel. The detection limit is 10(-11) M. Other metal ions, such as Li(+), Na(+), K(+), Mg(2+), and Ca(2+), have a marginal effect on the deflection of the microcantilever. The mechanism of the bending is discussed and the results showed that the microcantilever may be used for in situ detection of beryllium.

Engineering surface states of carbon dots to achieve controllable luminescence for solid-luminescent composites and sensitive Be2+ detection

“…By detecting changes in fluorescence intensity caused by external physical or chemical stimuli, such sensors can detect metal ions, such as Fe 3+ 910, Hg 2+ 515253, Cu 2+ 22 and so on. Many efforts have been recently made to detect Be 2+ ions by means of organic materials545556. In spite of good performance, the cost is still very high as such materials are prepared through complex synthetic routes and with quite low yields.…”

A 16-microcantilever array sensing system for the rapid and simultaneous detection of analyte

“…Four microcantilevers in each array (microcantilevers 1, 3,5,7,9,11,13,15 see Figure 6) were functionalized with a 10 -6 M solution of methoxy while decanethiol was immobilized on the other microcantilevers (microcantilevers 2,4,6,8,10, 12, 14, 16 see Figure 6). …”

“…The majority of the reported work performed with microcantilever sensors, to date, has been conducted using two single microcantilever sensor systems where one microcantilever is used as the active and one is used as the reference [11][12][13][14][15]. The use of a two-microcantilever system is very limiting as it only allows the investigation of one sensing layer on a single microcantilever at a time.…”

Enhancing detection sensitivity of piezoelectric plate sensor by increasing transverse electromechanical coupling constant

“…In the past two decades, label-free alternatives have been studied by many authors. Some of the examples include quartz crystal microbalance (QCM), 1-3 surface acoustic wave (SAW) devices, 4,5 surface plasmon resonance (SPR), 6,7 silicon microcantilevers, [8][9][10][11] electrochemical sensors, [12][13][14] nanotube and nanowire biosensors. [15][16][17] Although these label-free methods can be rapid and simpler, they generally lack the sensitivity of ELISA.…”